Einsteinium

<h2 id="history">History</h2>

Einsteinium was <a href="/facts/Timeline_of_chemical_element_discoveries/QY4X2RP3">first identified</a> in December 1952 by <a href="/facts/Albert_Ghiorso/jP5gHCwp">Albert Ghiorso</a> and co-workers at <a href="/facts/University_of_California%2c_Berkeley/MXVEjklr">University of California, Berkeley</a> in collaboration with the <a href="/facts/Argonne_National_Laboratory/EAoR1Rnm">Argonne</a> and <a href="/facts/Los_Alamos_National_Laboratory/tlrLkV7r">Los Alamos</a> National Laboratories, in the fallout from the <a href="/facts/Ivy_Mike/yFqF9H72">Ivy Mike</a> nuclear test. The test was done on November 1, 1952, at <a href="/facts/Enewetak_Atoll/Mj0yc3W3">Enewetak Atoll</a> in the <a href="/facts/Pacific_Ocean/bdxgXRVM">Pacific Ocean</a> and was the first successful test of a <a href="/facts/Thermonuclear_weapon/T9zFe3H0">thermonuclear weapon</a>.<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a> Initial examination of the debris from the explosion had shown the production of a new isotope of <a href="/facts/Plutonium/4bUw9zH3">plutonium</a>, 24494Pu, which could only have formed by the absorption of six <a href="/facts/Neutron/oRCM1geb">neutrons</a> by a <a href="/facts/Uranium-238/QhcHm6q8">uranium-238</a> nucleus followed by two <a href="/facts/Beta_decay/vxTBlckp">beta decays</a>.

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    {\displaystyle {\ce {^{238}_{92}U->[{\ce {+6(n,\gamma )}}][-2\ \beta ^{-}]{}_{94}^{244}Pu}}}

At the time, the multiple neutron absorption was thought to be an extremely rare process, but the identification of 244Pu indicated that still more neutrons could have been captured by the uranium, producing new elements heavier than <a href="/facts/Californium/AJVjoVut">californium</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a>

Ghiorso and co-workers analyzed filter papers which had been flown through the explosion cloud on airplanes (the same sampling technique that had been used to discover 244Pu).<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a> Larger amounts of radioactive material were later isolated from coral debris of the atoll, and these were delivered to the U.S.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a> The separation of suspected new elements was carried out in the presence of a <a href="/facts/Citric_acid/EgKGQBdl">citric acid</a>/<a href="/facts/Ammonium/jYm8wc1n">ammonium</a> <a href="/facts/Buffer_solution/zrLz9eaa">buffer solution</a> in a weakly acidic medium (<a href="/facts/PH/RnSv8D7y">pH</a> ≈ 3.5), using <a href="/facts/Ion_exchange/C2DPoGqg">ion exchange</a> at elevated temperatures; fewer than 200 atoms of einsteinium were recovered in the end.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a> Nevertheless, element 99, einsteinium, and in particular 253Es, could be detected via its characteristic high-energy <a href="/facts/Alpha_decay/rCsHNIUE">alpha decay</a> at 6.6 MeV.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a> It was produced by the <a href="/facts/Neutron_capture/elsFpM12">capture</a> of 15 <a href="/facts/Neutron/oRCM1geb">neutrons</a> by <a href="/facts/Uranium-238/QhcHm6q8">uranium-238</a> nuclei followed by seven beta decays, and had a <a href="/facts/Half-life/kGVH8BAB">half-life</a> of 20.5 days. Such multiple neutron absorption was made possible by the high neutron flux density during the detonation, so that newly generated heavy isotopes had plenty of available neutrons to absorb before they could disintegrate into lighter elements. Neutron capture initially raised the <a href="/facts/Mass_number/VyBbJ1oI">mass number</a> without changing the <a href="/facts/Atomic_number/bgAr581S">atomic number</a> of the nuclide, and the concomitant beta-decays resulted in a gradual increase in the atomic number:<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a>

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    {\displaystyle {\ce {^{238}_{92}U ->[{\ce {+15n}}][6 \beta^-] ^{253}_{98}Cf ->[\beta^-] ^{253}_{99}Es}}}

Some 238U atoms, however, could absorb two additional neutrons (for a total of 17), resulting in 255Es, as well as in the 255Fm isotope of another new element, <a href="/facts/Fermium/Us3rnvG5">fermium</a>.<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> The discovery of the new elements and the associated new data on multiple neutron capture were initially kept secret on the orders of the U.S. military until 1955 due to <a href="/facts/Cold_War/spJdJQ3q">Cold War</a> tensions and competition with Soviet Union in nuclear technologies.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a><a class="footnote-ref" id="fnref:13" href="#fn:13">13</a><a class="footnote-ref" id="fnref:14" href="#fn:14">14</a> However, the rapid capture of so many neutrons would provide needed direct experimental confirmation of the <a href="/facts/R-process/wEDL01yc">r-process</a> multi-neutron absorption needed to explain the cosmic <a href="/facts/Nucleosynthesis/F9MIeADF">nucleosynthesis</a> (production) of certain heavy elements (heavier than nickel) in <a href="/facts/Supernova/Pfo2J23l">supernovas</a>, before <a href="/facts/Beta_decay/vxTBlckp">beta decay</a>. Such a process is needed to explain the existence of many stable elements in the universe.<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a>
Meanwhile, isotopes of element 99 (as well as of new element 100, <a href="/facts/Fermium/Us3rnvG5">fermium</a>) were produced in the Berkeley and Argonne laboratories, in a <a href="/facts/Nuclear_fusion/hP0gLDqj">nuclear reaction</a> between <a href="/facts/Nitrogen/Nf1QpGDz">nitrogen</a>-14 and uranium-238,<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a> and later by intense neutron irradiation of <a href="/facts/Plutonium/4bUw9zH3">plutonium</a> or <a href="/facts/Californium/AJVjoVut">californium</a>:

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    {\displaystyle {\ce {^{252}_{98}Cf ->[{\ce {(n,\gamma)}}] ^{253}_{98}Cf ->[\beta^-][17.81 {\ce {d}}] ^{253}_{99}Es ->[{\ce {(n,\gamma)}}] ^{254}_{99}Es ->[\beta^-] ^{254}_{100}Fm}}}

These results were published in several articles in 1954 with the disclaimer that these were not the first studies that had been carried out on the elements.<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a><a class="footnote-ref" id="fnref:18" href="#fn:18">18</a><a class="footnote-ref" id="fnref:19" href="#fn:19">19</a><a class="footnote-ref" id="fnref:20" href="#fn:20">20</a><a class="footnote-ref" id="fnref:21" href="#fn:21">21</a> The Berkeley team also reported some results on the chemical properties of einsteinium and fermium.<a class="footnote-ref" id="fnref:22" href="#fn:22">22</a><a class="footnote-ref" id="fnref:23" href="#fn:23">23</a> The Ivy Mike results were declassified and published in 1955.<a class="footnote-ref" id="fnref:24" href="#fn:24">24</a>

In their discovery of elements 99 and 100, the American teams had competed with a group at the Nobel Institute for Physics, <a href="/facts/Stockholm/sD74W4Pm">Stockholm</a>, <a href="/facts/Sweden/u3qC7lyj">Sweden</a>. In late 1953 – early 1954, the Swedish group succeeded in synthesizing light isotopes of element 100, in particular 250Fm, by bombarding uranium with oxygen nuclei. These results were also published in 1954.<a class="footnote-ref" id="fnref:25" href="#fn:25">25</a> Nevertheless, the priority of the Berkeley team was generally recognized, as its publications preceded the Swedish article, and they were based on the previously undisclosed results of the 1952 thermonuclear explosion; thus the Berkeley team was given the privilege to name the new elements. As the effort which had led to the design of Ivy Mike was codenamed Project PANDA,<a class="footnote-ref" id="fnref:26" href="#fn:26">26</a> element 99 had been jokingly nicknamed "Pandemonium"<a class="footnote-ref" id="fnref:27" href="#fn:27">27</a> but the official names suggested by the Berkeley group derived from two prominent scientists, Einstein and Fermi: "We suggest for the name for the element with the atomic number 99, einsteinium (symbol E) after <a href="/facts/Albert_Einstein/CNTet8qu">Albert Einstein</a> and for the name for the element with atomic number 100, fermium (symbol Fm), after <a href="/facts/Enrico_Fermi/cmYcY15H">Enrico Fermi</a>."<a class="footnote-ref" id="fnref:28" href="#fn:28">28</a> Both Einstein and Fermi died between the time the names were originally proposed and when they were announced. The discovery of these new elements was announced by <a href="/facts/Albert_Ghiorso/jP5gHCwp">Albert Ghiorso</a> at the first Geneva Atomic Conference held on 8–20 August 1955.<a class="footnote-ref" id="fnref:29" href="#fn:29">29</a> The symbol for einsteinium was first given as "E" and later changed to "Es" by IUPAC.<a class="footnote-ref" id="fnref:30" href="#fn:30">30</a><a class="footnote-ref" id="fnref:31" href="#fn:31">31</a>

<h2 id="characteristics">Characteristics</h2>
<h3>Physical</h3>

Einsteinium is a synthetic, silvery, radioactive metal. In the <a href="/facts/Periodic_table/umdGIfUb">periodic table</a>, it is located to the right of the actinide <a href="/facts/Californium/AJVjoVut">californium</a>, to the left of the actinide <a href="/facts/Fermium/Us3rnvG5">fermium</a> and below the lanthanide <a href="/facts/Holmium/C73kJVtp">holmium</a> with which it shares many similarities in physical and chemical properties. Its density of 8.84 g/cm3 is lower than that of californium (15.1 g/cm3) and is nearly the same as that of holmium (8.79 g/cm3), despite einsteinium being much heavier per atom than holmium. Einsteinium's melting point (860 °C) is also relatively low – below californium (900 °C), fermium (1527 °C) and holmium (1461 °C).<a class="footnote-ref" id="fnref:32" href="#fn:32">32</a><a class="footnote-ref" id="fnref:33" href="#fn:33">33</a> Einsteinium is a soft metal, with a <a href="/facts/Bulk_modulus/yCRFQonn">bulk modulus</a> of only 15 GPa, one of the lowest among non-<a href="/facts/Alkali_metal/IkWbCLk2">alkali metals</a>.<a class="footnote-ref" id="fnref:34" href="#fn:34">34</a>
Unlike the lighter actinides <a href="/facts/Californium/AJVjoVut">californium</a>, <a href="/facts/Berkelium/ePryEYy3">berkelium</a>, <a href="/facts/Curium/LMyWXg8l">curium</a> and <a href="/facts/Americium/rxL9Yc64">americium</a>, which crystallize in a double <a href="/facts/Hexagonal_crystal_family/sSSok8wo">hexagonal</a> structure at ambient conditions; einsteinium is believed to have a <a href="/facts/Cubic_crystal_system/92Co7BKM">face-centered cubic</a> (fcc) symmetry with the space group Fm3m and the lattice constant a = 575 pm. However, there is a report of room-temperature hexagonal einsteinium metal with a = 398 pm and c = 650 pm, which converted to the fcc phase upon heating to 300 °C.<a class="footnote-ref" id="fnref:35" href="#fn:35">35</a>
The self-damage induced by the radioactivity of einsteinium is so strong that it rapidly destroys the crystal lattice,<a class="footnote-ref" id="fnref:36" href="#fn:36">36</a> and the energy release during this process, 1000 watts per gram of 253Es, induces a visible glow.<a class="footnote-ref" id="fnref:37" href="#fn:37">37</a> These processes may contribute to the relatively low density and melting point of einsteinium.<a class="footnote-ref" id="fnref:38" href="#fn:38">38</a> Further, due to the small size of available samples, the melting point of einsteinium was often deduced by observing the sample being heated inside an electron microscope.<a class="footnote-ref" id="fnref:39" href="#fn:39">39</a> Thus, surface effects in small samples could reduce the melting point.
The metal is trivalent and has a noticeably high volatility.<a class="footnote-ref" id="fnref:40" href="#fn:40">40</a> In order to reduce the self-radiation damage, most measurements of solid einsteinium and its compounds are performed right after thermal annealing.<a class="footnote-ref" id="fnref:41" href="#fn:41">41</a> Also, some compounds are studied under the atmosphere of the reductant gas, for example H2O+<a href="/facts/Hydrogen_chloride/7Wzkhomd">HCl</a> for EsOCl so that the sample is partly regrown during its decomposition.<a class="footnote-ref" id="fnref:42" href="#fn:42">42</a>
Apart from the self-destruction of solid einsteinium and its compounds, other intrinsic difficulties in studying this element include scarcity – the most common 253Es isotope is available only once or twice a year in sub-milligram amounts – and self-contamination due to rapid conversion of einsteinium to berkelium and then to californium at a rate of about 3.3% per day:<a class="footnote-ref" id="fnref:43" href="#fn:43">43</a><a class="footnote-ref" id="fnref:44" href="#fn:44">44</a><a class="footnote-ref" id="fnref:45" href="#fn:45">45</a>

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    {\displaystyle {\ce {^{253}_{99}Es ->[\alpha][20 {\ce {d}}] ^{249}_{97}Bk ->[\beta^-][314 {\ce {d}}] ^{249}_{98}Cf}}}

Thus, most einsteinium samples are contaminated, and their intrinsic properties are often deduced by extrapolating back experimental data accumulated over time. Other experimental techniques to circumvent the contamination problem include selective optical excitation of einsteinium ions by a tunable laser, such as in studying its luminescence properties.<a class="footnote-ref" id="fnref:46" href="#fn:46">46</a>
Magnetic properties have been studied for einsteinium metal, its oxide and fluoride. All three materials showed <a href="/facts/Curie%25E2%2580%2593Weiss_law/w4h6zNqb">Curie–Weiss</a> <a href="/facts/Paramagnetic/vj1SMbbp">paramagnetic</a> behavior from <a href="/facts/Liquid_helium/JYXCAcDf">liquid helium</a> to room temperature. The effective magnetic moments were deduced as 10.4±0.3 <a href="/facts/Bohr_magneton/sK2YxXAk">μB</a> for Es2O3 and 11.4±0.3 μB for the EsF3, which are the highest values among actinides, and the corresponding <a href="/facts/Curie_temperature/ygotSuMg">Curie temperatures</a> are 53 and 37 K.<a class="footnote-ref" id="fnref:47" href="#fn:47">47</a><a class="footnote-ref" id="fnref:48" href="#fn:48">48</a>

<h3>Chemical</h3>
Like all actinides, einsteinium is rather reactive. Its trivalent <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> is most stable in solids and aqueous solution where it induces a pale pink color.<a class="footnote-ref" id="fnref:49" href="#fn:49">49</a> The existence of divalent einsteinium is firmly established, especially in the solid phase; such +2 state is not observed in many other actinides, including <a href="/facts/Protactinium/v87VqTPf">protactinium</a>, <a href="/facts/Uranium/n2sGWBzU">uranium</a>, <a href="/facts/Neptunium/pwp7Yvds">neptunium</a>, <a href="/facts/Plutonium/4bUw9zH3">plutonium</a>, <a href="/facts/Curium/LMyWXg8l">curium</a> and <a href="/facts/Berkelium/ePryEYy3">berkelium</a>. Einsteinium(II) compounds can be obtained, for example, by reducing einsteinium(III) with <a href="/facts/Samarium(II)_chloride/dTX00151">samarium(II) chloride</a>.<a class="footnote-ref" id="fnref:50" href="#fn:50">50</a>

<h3>Isotopes</h3>
Main article: <a href="/facts/Isotopes_of_einsteinium/Uecqdyr4">Isotopes of einsteinium</a>
Eighteen isotopes and four <a href="/facts/Nuclear_isomer/L8DHcqnk">nuclear isomers</a> are known for einsteinium, with <a href="/facts/Mass_number/VyBbJ1oI">mass numbers</a> 240–257.<a class="footnote-ref" id="fnref:51" href="#fn:51">51</a> All are radioactive; the most stable one, 252Es, has half-life 471.7 days.<a class="footnote-ref" id="fnref:52" href="#fn:52">52</a> The next most stable isotopes are 254Es (half-life 275.7 days),<a class="footnote-ref" id="fnref:53" href="#fn:53">53</a> 255Es (39.8 days), and 253Es (20.47 days). All the other isotopes have half-lives shorter than 40 hours, most shorter than 30 minutes. Of the five isomers, the most stable is 254mEs with a half-life of 39.3 hours.<a class="footnote-ref" id="fnref:54" href="#fn:54">54</a>

<h3>Nuclear fission</h3>
Einsteinium has a high rate of <a href="/facts/Nuclear_fission/LfkIylvm">nuclear fission</a> that results in a low <a href="/facts/Critical_mass/wRAnE21M">critical mass</a>. This mass is 9.89 kilograms for a bare sphere of 254Es, and can be lowered to 2.9 kg by adding a 30-centimeter-thick steel <a href="/facts/Neutron_reflector/yDkgmcrE">neutron reflector</a>, or even to 2.26 kg with a 20-cm-thick reflector made of water. However, even this small critical mass far exceeds the total amount of einsteinium isolated so far, especially of the rare 254Es.<a class="footnote-ref" id="fnref:55" href="#fn:55">55</a>

<h3>Natural occurrence</h3>
Due to the short half-life of all isotopes of einsteinium, any <a href="/facts/Primordial_nuclide/lFAUqHDv">primordial</a> einsteinium—that is, einsteinium that could have been present on Earth at its formation—has long since decayed. Synthesis of einsteinium from naturally-occurring uranium and thorium in the Earth's crust requires multiple neutron capture, an extremely unlikely event. Therefore, all einsteinium on Earth is produced in laboratories, high-power nuclear reactors, or <a href="/facts/Nuclear_testing/s2srGDFP">nuclear testing</a>, and exists only within a few years from the time of the synthesis.<a class="footnote-ref" id="fnref:56" href="#fn:56">56</a>
The transuranic elements <a href="/facts/Americium/rxL9Yc64">americium</a> to <a href="/facts/Fermium/Us3rnvG5">fermium</a>, including einsteinium, were once created in the <a href="/facts/Natural_nuclear_fission_reactor/G7FIGsEV">natural nuclear fission reactor</a> at <a href="/facts/Oklo/p2jg2BuS">Oklo</a>, but any quantities produced then would have long since decayed away.<a class="footnote-ref" id="fnref:57" href="#fn:57">57</a>
Einsteinium was theoretically observed in the spectrum of <a href="/facts/Przybylski%2527s_Star/1unV7g8C">Przybylski's Star</a>.<a class="footnote-ref" id="fnref:58" href="#fn:58">58</a> However, the lead author of the studies finding einsteinium and other short-lived actinides in Przybylski's Star, Vera F. Gopka, admitted that "the position of lines of the radioactive elements under search were simply visualized in synthetic spectrum as vertical markers because there are not any atomic data for these lines except for their wavelengths (Sansonetti et al. 2004), enabling one to calculate their profiles with more or less real intensities."<a class="footnote-ref" id="fnref:59" href="#fn:59">59</a> The signature spectra of einsteinium's isotopes have since been comprehensively analyzed experimentally (in 2021),<a class="footnote-ref" id="fnref:60" href="#fn:60">60</a> though there is no published research confirming whether the theorized einsteinium signatures proposed to be found in the star's spectrum match the lab-determined results.

<h2 id="synthesis-and-extraction">Synthesis and extraction</h2>

Einsteinium is produced in minute quantities by bombarding lighter actinides with neutrons in dedicated high-flux <a href="/facts/Nuclear_reactor/8xqjIbge">nuclear reactors</a>. The world's major irradiation sources are the 85-megawatt <a href="/facts/High_Flux_Isotope_Reactor/BmAqsqgq">High Flux Isotope Reactor</a> (HFIR) at <a href="/facts/Oak_Ridge_National_Laboratory/Elq84HKF">Oak Ridge National Laboratory</a> (ORNL), Tennessee, U.S.,<a class="footnote-ref" id="fnref:61" href="#fn:61">61</a> and the SM-2 loop reactor at the <a href="/facts/Research_Institute_of_Atomic_Reactors/NMa2AJF0">Research Institute of Atomic Reactors</a> (NIIAR) in <a href="/facts/Dimitrovgrad%2c_Russia/26R1F29h">Dimitrovgrad, Russia</a>,<a class="footnote-ref" id="fnref:62" href="#fn:62">62</a> which are both dedicated to the production of transcurium (Z>96) elements. These facilities have similar power and flux levels, and are expected to have comparable production capacities for transcurium elements,<a class="footnote-ref" id="fnref:63" href="#fn:63">63</a> though the quantities produced at NIIAR are not widely reported. In a "typical processing campaign" at ORNL, tens of grams of <a href="/facts/Curium/LMyWXg8l">curium</a> are irradiated to produce decigram quantities of <a href="/facts/Californium/AJVjoVut">californium</a>, milligrams of berkelium (249Bk) and einsteinium and picograms of <a href="/facts/Fermium/Us3rnvG5">fermium</a>.<a class="footnote-ref" id="fnref:64" href="#fn:64">64</a><a class="footnote-ref" id="fnref:65" href="#fn:65">65</a>
The first microscopic sample of 253Es sample weighing about 10 <a href="/facts/Nanogram/2jIXpAFv">nanograms</a> was prepared in 1961 at HFIR. A special magnetic balance was designed to estimate its weight.<a class="footnote-ref" id="fnref:66" href="#fn:66">66</a><a class="footnote-ref" id="fnref:67" href="#fn:67">67</a> Larger batches were produced later starting from several kilograms of plutonium with the einsteinium yields (mostly 253Es) of 0.48 milligram in 1967–1970, 3.2 milligrams in 1971–1973, followed by steady production of about 3 milligrams per year between 1974 and 1978.<a class="footnote-ref" id="fnref:68" href="#fn:68">68</a> These quantities however refer to the integral amount in the target right after irradiation. Subsequent separation procedures reduced the amount of isotopically pure einsteinium roughly tenfold.<a class="footnote-ref" id="fnref:69" href="#fn:69">69</a>

<h3>Laboratory synthesis</h3>
Heavy neutron irradiation of plutonium results in four major isotopes of einsteinium: 253Es (α-emitter; half-life 20.47 days, spontaneous fission half-life 7×105 years); 254mEs (β-emitter, half-life 39.3 hours), 254Es (α-emitter, half-life 276 days) and 255Es (β-emitter, half-life 39.8 days).<a class="footnote-ref" id="fnref:70" href="#fn:70">70</a><a class="footnote-ref" id="fnref:71" href="#fn:71">71</a> An alternative route involves bombardment of uranium-238 with high-intensity nitrogen or oxygen ion beams.<a class="footnote-ref" id="fnref:72" href="#fn:72">72</a>
247Es (half-life 4.55 min) was produced by irradiating 241Am with carbon or 238U with nitrogen ions.<a class="footnote-ref" id="fnref:73" href="#fn:73">73</a> The latter reaction was first realized in 1967 in Dubna, Russia, and the involved scientists were awarded the <a href="/facts/Lenin_Komsomol_Prize/Q8mblgNq">Lenin Komsomol Prize</a>.<a class="footnote-ref" id="fnref:74" href="#fn:74">74</a>
248Es was produced by irradiating 249Cf with <a href="/facts/Deuterium/Bv4wfCkw">deuterium</a> ions. It mainly β-decays to 248Cf with a half-life of 25±5 minutes, but also releases 6.87-MeV α-particles; the ratio of β's to α-particles is about 400.<a class="footnote-ref" id="fnref:75" href="#fn:75">75</a>

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          )
        
      
    
    {\displaystyle {\ce {^{249}_{98}Cf + ^{2}_{1}H -> ^{248}_{99}Es + 3^{1}_{0}n}}\quad \left({\ce {^{248}_{99}Es ->[\epsilon][27 {\ce {min}}] ^{248}_{98}Cf}}\right)}

249, 250, 251, 252Es were obtained by bombarding 249Bk with α-particles. One to four neutrons are released, so four different isotopes are formed in one reaction.<a class="footnote-ref" id="fnref:76" href="#fn:76">76</a>

Bk
            
            
            
            97
            249
          
          
            
              →
              
                +
                α
              
            
          
          
            Es
            
            
            
            99
            
              249
              
              ,
              250
              
              ,
              251
              
              ,
              252
            
          
        
      
    
    {\displaystyle {\ce {^{249}_{97}Bk ->[+\alpha] ^{249,250,251,252}_{99}Es}}}

253Es was produced by irradiating a 0.1–0.2 milligram 252Cf target with a <a href="/facts/Thermal_neutron/UMKR4XgJ">thermal neutron</a> flux of (2–5)×1014 neutrons/(cm2·s) for 500–900 hours:<a class="footnote-ref" id="fnref:77" href="#fn:77">77</a>

Cf
            
            
            
            98
            252
          
          
            
              →
              
                
                  
                    (
                    n
                    ,
                    γ
                    )
                  
                
              
            
          
          
            Cf
            
            
            
            98
            253
          
          
            
              →
              
                17.81
                
                  d
                
              
              
                
                  β
                  −
                
              
            
          
          
            Es
            
            
            
            99
            253
          
        
      
    
    {\displaystyle {\ce {^{252}_{98}Cf ->[{\ce {(n,\gamma)}}] ^{253}_{98}Cf ->[\beta^-][17.81 {\ce {d}}] ^{253}_{99}Es}}}

In 2020, scientists at ORNL created about 200 nanograms of 254Es; allowing some chemical properties of the element to be studied for the first time.<a class="footnote-ref" id="fnref:78" href="#fn:78">78</a>

<h3>Synthesis in nuclear explosions</h3>

The analysis of the debris at the 10-<a href="/facts/TNT_equivalent/nEQ5z8mp">megaton</a> Ivy Mike nuclear test was a part of long-term project. One of the goals was studying the efficiency of production of transuranic elements in high-power nuclear explosions. The motive for these experiments was that synthesis of such elements from uranium requires multiple neutron capture. The probability of such events increases with the <a href="/facts/Neutron_flux/nDE9Nlrx">neutron flux</a>, and nuclear explosions are the most powerful man-made neutron sources, providing densities of the order 1023 neutrons/cm2 within a microsecond, or about 1029 neutrons/(cm2·s). In comparison, the flux of HFIR is 5×1015 neutrons/(cm2·s). A dedicated laboratory was set up right at <a href="/facts/Enewetak_Atoll/Mj0yc3W3">Enewetak Atoll</a> for preliminary analysis of debris, as some isotopes could have decayed by the time the debris samples reached the mainland U.S. The laboratory was receiving samples for analysis as soon as possible, from airplanes equipped with paper filters which flew over the atoll after the tests. Whereas it was hoped to discover new chemical elements heavier than fermium, none of these were found even after a series of megaton explosions conducted between 1954 and 1956 at the atoll.<a class="footnote-ref" id="fnref:79" href="#fn:79">79</a>
The atmospheric results were supplemented by the underground test data accumulated in the 1960s at the <a href="/facts/Nevada_Test_Site/eWg04MIr">Nevada Test Site</a>, as it was hoped that powerful explosions in a confined space might give improved yields and heavier isotopes. Apart from traditional uranium charges, combinations of uranium with americium and <a href="/facts/Thorium/ysdWH470">thorium</a> have been tried, as well as a mixed plutonium-neptunium charge, but they were less successful in terms of yield and was attributed to stronger losses of heavy isotopes due to enhanced fission rates in heavy-element charges. Product isolation was problematic as the explosions were spreading debris through melting and vaporizing the surrounding rocks at depths of 300–600 meters. Drilling to such depths to extract the products was both slow and inefficient in terms of collected volumes.<a class="footnote-ref" id="fnref:80" href="#fn:80">80</a><a class="footnote-ref" id="fnref:81" href="#fn:81">81</a>
Of the nine underground tests between 1962 and 1969,<a class="footnote-ref" id="fnref:82" href="#fn:82">82</a><a class="footnote-ref" id="fnref:83" href="#fn:83">83</a> the last one was the most powerful and had the highest yield of transuranics. Milligrams of einsteinium that would normally take a year of irradiation in a high-power reactor, were produced within a microsecond.<a class="footnote-ref" id="fnref:84" href="#fn:84">84</a> However, the major practical problem of the entire proposal was collecting the radioactive debris dispersed by the powerful blast. Aircraft filters adsorbed only ~4×10−14 of the total amount, and collection of tons of corals at Enewetak Atoll increased this fraction by only two orders of magnitude. Extraction of about 500 kilograms of underground rocks 60 days after the Hutch explosion recovered only ~1×10−7 of the total charge. The amount of transuranic elements in this 500-kg batch was only 30 times higher than in a 0.4-kg rock picked up 7 days after the test which showed the highly non-linear dependence of the transuranics yield on the amount of retrieved radioactive rock.<a class="footnote-ref" id="fnref:85" href="#fn:85">85</a> Shafts were drilled at the site before the test in order to accelerate sample collection after explosion, so that explosion would expel radioactive material from the epicenter through the shafts and to collecting volumes near the surface. This method was tried in two tests and instantly provided hundreds of kilograms of material, but with actinide concentration 3 times lower than in samples obtained after drilling. Whereas such method could have been efficient in scientific studies of short-lived isotopes, it could not improve the overall collection efficiency of the produced actinides.<a class="footnote-ref" id="fnref:86" href="#fn:86">86</a>
Though no new elements (except einsteinium and fermium) could be detected in the nuclear test debris, and the total yields of transuranics were disappointingly low, these tests did provide significantly higher amounts of rare heavy isotopes than previously available in laboratories.<a class="footnote-ref" id="fnref:87" href="#fn:87">87</a>

<h3>Separation</h3>

Separation procedure of einsteinium depends on the synthesis method. In the case of light-ion bombardment inside a cyclotron, the heavy ion target is attached to a thin foil, and the generated einsteinium is simply washed off the foil after the irradiation. However, the produced amounts in such experiments are relatively low.<a class="footnote-ref" id="fnref:88" href="#fn:88">88</a> The yields are much higher for reactor irradiation, but there, the product is a mixture of various actinide isotopes, as well as lanthanides produced in the nuclear fission decays. In this case, isolation of einsteinium is a tedious procedure which involves several repeating steps of cation exchange, at elevated temperature and pressure, and chromatography. Separation from berkelium is important, because the most common einsteinium isotope produced in nuclear reactors, 253Es, decays with a half-life of only 20 days to 249Bk, which is fast on the timescale of most experiments. Such separation relies on the fact that berkelium easily oxidizes to the solid +4 state and precipitates, whereas other actinides, including einsteinium, remain in their +3 state in solutions.<a class="footnote-ref" id="fnref:89" href="#fn:89">89</a>
Trivalent actinides can be separated from lanthanide fission products by a cation-exchange resin column using a 90% water/10% ethanol solution saturated with <a href="/facts/Hydrochloric_acid/HqItJlUT">hydrochloric acid</a> (HCl) as <a href="/facts/Eluant/ns3pIr7e">eluant</a>. It is usually followed by <a href="/facts/Anion-exchange_chromatography/thdU5FX4">anion-exchange chromatography</a> using 6 <a href="/facts/Molar_concentration/P2WL5b9q">molar</a> HCl as eluant. A cation-exchange resin column (Dowex-50 exchange column) treated with ammonium salts is then used to separate fractions containing elements 99, 100 and 101. These elements can be then identified simply based on their elution position/time, using α-hydroxyisobutyrate solution (α-HIB), for example, as eluant.<a class="footnote-ref" id="fnref:90" href="#fn:90">90</a>
The 3+ actinides can also be separated via solvent extraction chromatography, using bis-(2-ethylhexyl) phosphoric acid (abbreviated as HDEHP) as the stationary organic phase, and nitric acid as the mobile aqueous phase. The actinide elution sequence is reversed from that of the cation-exchange resin column. The einsteinium separated by this method has the advantage to be free of organic complexing agent, as compared to the separation using a resin column.<a class="footnote-ref" id="fnref:91" href="#fn:91">91</a>

<h3>Preparation of the metal</h3>
Einsteinium is highly reactive, so strong reducing agents are required to obtain the pure metal from its compounds.<a class="footnote-ref" id="fnref:92" href="#fn:92">92</a> This can be achieved by reduction of <a href="/facts/Einsteinium(III)_fluoride/Fykw7e5L">einsteinium(III) fluoride</a> with metallic <a href="/facts/Lithium/7vXX6BWA">lithium</a>:

EsF3 + 3 Li → Es + 3 LiF
However, owing to its low melting point and high rate of self-radiation damage, einsteinium has a higher vapor pressure than <a href="/facts/Lithium_fluoride/ujl6o884">lithium fluoride</a>. This makes this reduction reaction rather inefficient. It was tried in the early preparation attempts and quickly abandoned in favor of reduction of einsteinium(III) oxide with <a href="/facts/Lanthanum/Uhmmy1sB">lanthanum</a> metal:<a class="footnote-ref" id="fnref:93" href="#fn:93">93</a><a class="footnote-ref" id="fnref:94" href="#fn:94">94</a><a class="footnote-ref" id="fnref:95" href="#fn:95">95</a>

Es2O3 + 2 La → 2 Es + La2O3
<h2 id="chemical-compounds">Chemical compounds</h2>
Main article: <a href="/facts/Einsteinium_compounds/LBjfIeKS">Einsteinium compounds</a>
Crystal structure and lattice constants of some Es compounds<table><tbody><tr><th>Compound</th><th>Color</th><th>Symmetry</th><th><a href="/facts/Space_group/2XQx0J7M">Space group</a></th><th>No</th><th><a href="/facts/Pearson_symbol/K3qljnNu">Pearson symbol</a></th><th>a (<a href="/facts/Picometre/Cb54mVBX">pm</a>)</th><th>b (pm)</th><th>c (pm)</th></tr><tr><td>Es2O3</td><td>Colorless</td><td>Cubic<a class="footnote-ref" id="fnref:96" href="#fn:96">96</a></td><td>Ia3</td><td>206</td><td>cI80</td><td>1076.6</td><td></td><td></td></tr><tr><td>Es2O3</td><td>Colorless</td><td><a href="/facts/Monoclinic_crystal_system/5PCwXvzX">Monoclinic</a><a class="footnote-ref" id="fnref:97" href="#fn:97">97</a></td><td>C2/m</td><td>12</td><td>mS30</td><td>1411</td><td>359</td><td>880</td></tr><tr><td>Es2O3</td><td>Colorless</td><td>Hexagonal<a class="footnote-ref" id="fnref:98" href="#fn:98">98</a></td><td>P3m1</td><td>164</td><td>hP5</td><td>370</td><td></td><td>600</td></tr><tr><td>EsF3</td><td></td><td>Hexagonal<a class="footnote-ref" id="fnref:99" href="#fn:99">99</a></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>EsF4</td><td></td><td>Monoclinic<a class="footnote-ref" id="fnref:100" href="#fn:100">100</a></td><td>C2/c</td><td>15</td><td>mS60</td><td></td><td></td><td></td></tr><tr><td>EsCl3</td><td>Orange</td><td>Hexagonal<a class="footnote-ref" id="fnref:101" href="#fn:101">101</a><a class="footnote-ref" id="fnref:102" href="#fn:102">102</a></td><td>C63/m</td><td></td><td>hP8</td><td>727</td><td></td><td>410</td></tr><tr><td>EsBr3</td><td>Yellow</td><td>Monoclinic<a class="footnote-ref" id="fnref:103" href="#fn:103">103</a></td><td>C2/m</td><td>12</td><td>mS16</td><td>727</td><td>1259</td><td>681</td></tr><tr><td>EsI3</td><td>Amber</td><td>Hexagonal<a class="footnote-ref" id="fnref:104" href="#fn:104">104</a><a class="footnote-ref" id="fnref:105" href="#fn:105">105</a></td><td>R3</td><td>148</td><td>hR24</td><td>753</td><td></td><td>2084</td></tr><tr><td>EsOCl</td><td></td><td>Tetragonal<a class="footnote-ref" id="fnref:106" href="#fn:106">106</a><a class="footnote-ref" id="fnref:107" href="#fn:107">107</a></td><td>P4/nmm</td><td></td><td></td><td>394.8</td><td></td><td>670.2</td></tr></tbody></table>
<h3>Oxides</h3>
Einsteinium(III) oxide (Es2O3) was obtained by burning einsteinium(III) nitrate. It forms colorless cubic crystals, which were first characterized from microgram samples sized about 30 nanometers.<a class="footnote-ref" id="fnref:108" href="#fn:108">108</a><a class="footnote-ref" id="fnref:109" href="#fn:109">109</a> Two other phases, <a href="/facts/Monoclinic_crystal_system/5PCwXvzX">monoclinic</a> and hexagonal, are known for this oxide. The formation of a certain Es2O3 phase depends on the preparation technique and sample history, and there is no clear phase diagram. Interconversions between the three phases can occur spontaneously, as a result of self-irradiation or self-heating.<a class="footnote-ref" id="fnref:110" href="#fn:110">110</a> The hexagonal phase is isotypic with <a href="/facts/Lanthanum_oxide/zUdsqgAx">lanthanum oxide</a> where the Es3+ ion is surrounded by a 6-coordinated group of O2− ions.<a class="footnote-ref" id="fnref:111" href="#fn:111">111</a><a class="footnote-ref" id="fnref:112" href="#fn:112">112</a>

<h3>Halides</h3>

Einsteinium <a href="/facts/Halide/ujYu8kGD">halides</a> are known for the oxidation states +2 and +3.<a class="footnote-ref" id="fnref:113" href="#fn:113">113</a><a class="footnote-ref" id="fnref:114" href="#fn:114">114</a> The most stable state is +3 for all halides from fluoride to iodide.
Einsteinium(III) fluoride (EsF3) can be precipitated from Es(III) chloride solutions upon reaction with <a href="/facts/Fluoride/LpqNMzwa">fluoride</a> ions. An alternative preparation procedure is to exposure Es(III) oxide to <a href="/facts/Chlorine_trifluoride/QhAU6UL6">chlorine trifluoride</a> (ClF3) or F2 gas at a pressure of 1–2 atmospheres and temperature 300–400°C. The EsF3 crystal structure is hexagonal, as in californium(III) fluoride (CfF3) where the Es3+ ions are 8-fold coordinated by fluorine ions in a bicapped <a href="/facts/Octahedral_molecular_geometry/bNXLVvks">trigonal prism</a> arrangement.<a class="footnote-ref" id="fnref:115" href="#fn:115">115</a><a class="footnote-ref" id="fnref:116" href="#fn:116">116</a><a class="footnote-ref" id="fnref:117" href="#fn:117">117</a>
Es(III) chloride (EsCl3) can be prepared by annealing Es(III) oxide in the atmosphere of dry hydrogen chloride vapors at about 500°C for some 20 minutes. It crystallizes upon cooling at about 425°C into an orange solid with a <a href="/facts/Hexagonal_crystal_family/sSSok8wo">hexagonal</a> structure of <a href="/facts/Uranium(III)_chloride/vNtL0fPQ">UCl3 type</a>, where einsteinium atoms are 9-fold coordinated by chlorine atoms in a tricapped trigonal prism geometry.<a class="footnote-ref" id="fnref:118" href="#fn:118">118</a><a class="footnote-ref" id="fnref:119" href="#fn:119">119</a><a class="footnote-ref" id="fnref:120" href="#fn:120">120</a> <a href="/facts/Einsteinium(III)_bromide/xwSxbhb7">Einsteinium(III) bromide</a> (EsBr3) is a pale-yellow solid with a <a href="/facts/Monoclinic_crystal_system/5PCwXvzX">monoclinic</a> structure of <a href="/facts/Aluminium_chloride/xrhvSxDr">AlCl3 type</a>, where the einsteinium atoms are <a href="/facts/Octahedral_molecular_geometry/bNXLVvks">octahedrally</a> coordinated by bromine (coordination number 6).<a class="footnote-ref" id="fnref:121" href="#fn:121">121</a><a class="footnote-ref" id="fnref:122" href="#fn:122">122</a>
The divalent compounds of einsteinium are obtained by reducing the trivalent halides with <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a>:<a class="footnote-ref" id="fnref:123" href="#fn:123">123</a>

2 EsX3 + H2 → 2 EsX2 + 2 HX; X = F, Cl, Br, I
<a href="/facts/Einsteinium(II)_chloride/cpzlQTzx">Einsteinium(II) chloride</a> (EsCl2),<a class="footnote-ref" id="fnref:124" href="#fn:124">124</a> <a href="/facts/Einsteinium(II)_bromide/pvWC2tdp">einsteinium(II) bromide</a> (EsBr2),<a class="footnote-ref" id="fnref:125" href="#fn:125">125</a> and <a href="/facts/Einsteinium(II)_iodide/WlWFq0zG">einsteinium(II) iodide</a> (EsI2)<a class="footnote-ref" id="fnref:126" href="#fn:126">126</a> have been produced and characterized by optical absorption, with no structural information available yet.<a class="footnote-ref" id="fnref:127" href="#fn:127">127</a>
Known oxyhalides of einsteinium include EsOCl,<a class="footnote-ref" id="fnref:128" href="#fn:128">128</a> EsOBr<a class="footnote-ref" id="fnref:129" href="#fn:129">129</a> and EsOI.<a class="footnote-ref" id="fnref:130" href="#fn:130">130</a> These salts are synthesized by treating a trihalide with a vapor mixture of water and the corresponding hydrogen halide: for example, EsCl3 + H2O/HCl to obtain EsOCl.<a class="footnote-ref" id="fnref:131" href="#fn:131">131</a>

<h3>Organoeinsteinium compounds</h3>
Einsteinium's high radioactivity has a potential use in <a href="/facts/Radiation_therapy/j60q5EC6">radiation therapy</a>, and organometallic complexes have been synthesized in order to deliver einsteinium to an appropriate organ in the body. Experiments have been performed on injecting einsteinium <a href="/facts/Citric_acid/EgKGQBdl">citrate</a> (as well as fermium compounds) to dogs.<a class="footnote-ref" id="fnref:132" href="#fn:132">132</a> Einsteinium(III) was also incorporated into β-diketone <a href="/facts/Chelation/4G79sXBB">chelate</a> complexes, since analogous complexes with lanthanides previously showed strongest UV-excited <a href="/facts/Luminescence/1QkIWyUj">luminescence</a> among metallorganic compounds. When preparing einsteinium complexes, the Es3+ ions were 1000 times diluted with Gd3+ ions. This allowed reducing the radiation damage so that the compounds did not disintegrate during the 20 minutes required for the measurements. The resulting luminescence from Es3+ was much too weak to be detected. This was explained by the unfavorable relative energies of the individual constituents of the compound that hindered efficient energy transfer from the chelate matrix to Es3+ ions. Similar conclusion was drawn for americium, berkelium and fermium.<a class="footnote-ref" id="fnref:133" href="#fn:133">133</a>
Luminescence of Es3+ ions was however observed in inorganic hydrochloric acid solutions as well as in organic solution with di(2-ethylhexyl)orthophosphoric acid. It shows a broad peak at about 1064 nanometers (half-width about 100 nm) which can be resonantly excited by green light (ca. 495 nm wavelength). The luminescence has a lifetime of several microseconds and the quantum yield below 0.1%. The relatively high, compared to lanthanides, non-radiative decay rates in Es3+ were associated with the stronger interaction of f-electrons with the inner Es3+ electrons.<a class="footnote-ref" id="fnref:134" href="#fn:134">134</a>

<h2 id="applications">Applications</h2>
There is almost no use for any isotope of einsteinium outside basic scientific research aiming at production of higher <a href="/facts/Transuranium_element/a12PwdAw">transuranium elements</a> and <a href="/facts/Superheavy_element/9PjYvCc3">superheavy elements</a>.<a class="footnote-ref" id="fnref:135" href="#fn:135">135</a>
In 1955, <a href="/facts/Mendelevium/bEHBu18F">mendelevium</a> was synthesized by irradiating a target consisting of about 109 atoms of 253Es in the 60-inch cyclotron at Berkeley Laboratory. The resulting 253Es(α,n)256Md reaction yielded 17 atoms of the new element with the atomic number of 101.<a class="footnote-ref" id="fnref:136" href="#fn:136">136</a>
The rare isotope <a href="/facts/Isotopes_of_einsteinium/Uecqdyr4">254Es</a> is favored for production of <a href="/facts/Superheavy_element/9PjYvCc3">superheavy elements</a> due to its large mass, relatively long half-life of 270 days, and availability in significant amounts of several micrograms.<a class="footnote-ref" id="fnref:137" href="#fn:137">137</a> Hence 254Es was used as a target in the attempted synthesis of <a href="/facts/Ununennium/WnpMG7CP">ununennium</a> (element 119) in 1985 by bombarding it with <a href="/facts/Calcium-48/cqqfNkMY">calcium-48</a> ions at the superHILAC <a href="/facts/Linear_particle_accelerator/GIz6Uc4x">linear particle accelerator</a> at Berkeley, California. No atoms were identified, setting an upper limit for the cross section of this reaction at 300 <a href="/facts/Barn_(unit)/0yCEtKJ9">nanobarns</a>.<a class="footnote-ref" id="fnref:138" href="#fn:138">138</a>

Es
              
              
              
              99
              254
            
          
          +
          
            
              Ca
              
              
              
              20
              48
            
          
          ⟶
          
            
              Uue
              
              ∗
              
              119
              302
            
          
          ⟶
          no
           
          atoms
        
      
    
    {\displaystyle {\ce {{^{254}_{99}Es}+{^{48}_{20}Ca}->{^{302}_{119}Uue^{\ast }}->no\ atoms}}}

254Es was used as the calibration marker in the chemical analysis spectrometer ("<a href="/facts/Surveyor_5/QRUdIXAM">alpha-scattering surface analyzer</a>") of the <a href="/facts/Surveyor_5/QRUdIXAM">Surveyor 5</a> lunar probe. The large mass of this isotope reduced the spectral overlap between signals from the marker and the studied lighter elements of the lunar surface.<a class="footnote-ref" id="fnref:139" href="#fn:139">139</a>

<h2 id="safety">Safety</h2>
Most of the available einsteinium toxicity data is from research on animals. Upon ingestion by <a href="/facts/Laboratory_rat/3dhWomAf">rats</a>, only ~0.01% of it ends in the bloodstream. From there, about 65% goes to the bones, where it would remain for ~50 years if not for its radioactive decay, not to speak of the 3-year maximum lifespan of rats, 25% to the lungs (biological half-life ~20 years, though this is again rendered irrelevant by the short half-life of einsteinium), 0.035% to the testicles or 0.01% to the ovaries – where einsteinium stays indefinitely. About 10% of the ingested amount is excreted. The distribution of einsteinium over bone surfaces is uniform and is similar to that of plutonium.<a class="footnote-ref" id="fnref:140" href="#fn:140">140</a>

<h2 id="bibliography">Bibliography</h2>
<ul><li>Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0080379418.</li>
<li>Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf">The Chemistry of the Actinide and Transactinide Elements</a> (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1007%2F1-4020-3598-5_12">10.1007/1-4020-3598-5_12</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-1-4020-3555-5. Archived from <a href="http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf">the original</a> (PDF) on 2010-07-17.</li>
<li>Holleman, Arnold F. & Wiberg, Nils (2007). Textbook of Inorganic Chemistry (102nd ed.). Berlin: de Gruyter. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-3-11-017770-1.</li>
<li>Seaborg, G.T., ed. (23 January 1978). <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf">Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100</a> (PDF). Report LBL-7701.</li></ul>
<h2 id="external-links">External links</h2>

Wikimedia Commons has media related to Einsteinium.

Look up einsteinium in Wiktionary, the free dictionary.

<ul><li><a href="http://www.periodicvideos.com/videos/099.htm">Einsteinium</a> at <a href="/facts/The_Periodic_Table_of_Videos/vC5kbN0M">The Periodic Table of Videos</a> (University of Nottingham)</li>
<li><a href="https://books.google.com/books?id=cgqNoNWLGBMC&pg=PA311">Age-related factors in radionuclide metabolism and dosimetry: Proceedings</a> – contains several health related studies of einsteinium</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">Einsteinium Archived 2021-05-19 at the Wayback Machine. periodic.lanl.gov <a href="http://periodic.lanl.gov/99.shtml" target="_blank">http://periodic.lanl.gov/99.shtml</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">Haire, p. 1579 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">Hammond C. R. "The elements" in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton, Florida: CRC Press. ISBN 0-8493-0486-5. <a href="0-8493-0486-5" target="_blank">0-8493-0486-5</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">Seaborg, p. 39 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">John Emsley (2003). Nature's building blocks: an A-Z guide to the elements. Oxford University Press. pp. 133–135. ISBN 0-19-850340-7. Archived from the original on 2016-06-09. <a href="0-19-850340-7" target="_blank">0-19-850340-7</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">254Es, 254Fm and 253Fm would not be produced because of lack of beta decay in 254Cf and 253Es <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">Ghiorso, A.; Thompson, S.; Higgins, G.; Seaborg, G.; Studier, M.; Fields, P.; Fried, S.; Diamond, H.; Mech, J.; Pyle, G.; Huizenga, J.; Hirsch, A.; Manning, W.; Browne, C.; Smith, H.; Spence, R. (1955). "New Elements Einsteinium and Fermium, Atomic Numbers 99 and 100". Phys. Rev. 99 (3): 1048–1049. Bibcode:1955PhRv...99.1048G. doi:10.1103/PhysRev.99.1048. Archived from the original on 2021-05-19. Retrieved 2010-11-24. Seaborg, Glenn Theodore (1994), Modern Alchemy: Selected Papers of Glenn T. Seaborg, World Scientific, ISBN 9789810214401, archived from the original on 2016-04-13 <a href="9789810214401" target="_blank">9789810214401</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">Fields, P.; Studier, M.; Diamond, H.; Mech, J.; Inghram, M.; Pyle, G.; Stevens, C.; Fried, S.; Manning, W.; Pyle, G.; Huizenga, J.; Hirsch, A.; Manning, W.; Browne, C.; Smith, H.; Spence, R. (1956). "Transplutonium Elements in Thermonuclear Test Debris". Physical Review. 102 (1): 180–182. Bibcode:1956PhRv..102..180F. doi:10.1103/PhysRev.102.180. ISBN 978-981-02-1440-1. Archived from the original on 2016-04-23 – via Google Books. {{cite journal}}: ISBN / Date incompatibility (help) <a href="978-981-02-1440-1" target="_blank">978-981-02-1440-1</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
<li id="fn:15">Byrne, J. (2011). Neutrons, Nuclei, and Matter. Mineola, NY: Dover Publications. ISBN 978-0-486-48238-5. (pbk.) pp. 267. <a href="978-0-486-48238-5" target="_blank">978-0-486-48238-5</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></li>
<li id="fn:16">Ghiorso, Albert; Rossi, G. Bernard; Harvey, Bernard G. & Thompson, Stanley G. (1954). "Reactions of U-238 with Cyclotron-Produced Nitrogen Ions". Physical Review. 93 (1): 257. Bibcode:1954PhRv...93..257G. doi:10.1103/PhysRev.93.257. S2CID 121499772. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">Thompson, S. G.; Ghiorso, A.; Harvey, B. G.; Choppin, G. R. (1954). "Transcurium Isotopes Produced in the Neutron Irradiation of Plutonium". Physical Review. 93 (4): 908. Bibcode:1954PhRv...93..908T. doi:10.1103/PhysRev.93.908. Archived from the original on 2020-03-16. Retrieved 2019-07-14. <a href="https://digital.library.unt.edu/ark:/67531/metadc1016991/" target="_blank">https://digital.library.unt.edu/ark:/67531/metadc1016991/</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
<li id="fn:18">Harvey, Bernard; Thompson, Stanley; Ghiorso, Albert; Choppin, Gregory (1954). "Further Production of Transcurium Nuclides by Neutron Irradiation". Physical Review. 93 (5): 1129. Bibcode:1954PhRv...93.1129H. doi:10.1103/PhysRev.93.1129. Archived from the original on 2020-03-09. Retrieved 2019-07-14. <a href="http://www.escholarship.org/uc/item/7884m0gv" target="_blank">http://www.escholarship.org/uc/item/7884m0gv</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></li>
<li id="fn:19">Studier, M.; Fields, P.; Diamond, H.; Mech, J.; Friedman, A.; Sellers, P.; Pyle, G.; Stevens, C.; Magnusson, L.; Huizenga, J. (1954). "Elements 99 and 100 from Pile-Irradiated Plutonium". Physical Review. 93 (6): 1428. Bibcode:1954PhRv...93.1428S. doi:10.1103/PhysRev.93.1428. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></li>
<li id="fn:20">Choppin, G. R.; Thompson, S. G.; Ghiorso, A.; Harvey, B. G. (1954). "Nuclear Properties of Some Isotopes of Californium, Elements 99 and 100". Physical Review. 94 (4): 1080–1081. Bibcode:1954PhRv...94.1080C. doi:10.1103/PhysRev.94.1080. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></li>
<li id="fn:21">Fields, P.; Studier, M.; Mech, J.; Diamond, H.; Friedman, A.; Magnusson, L.; Huizenga, J. (1954). "Additional Properties of Isotopes of Elements 99 and 100". Physical Review. 94 (1): 209–210. Bibcode:1954PhRv...94..209F. doi:10.1103/PhysRev.94.209. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></li>
<li id="fn:22">Seaborg, G. T.; Thompson, S.G.; Harvey, B.G. and Choppin, G.R. (July 23, 1954), "Chemical Properties of Elements 99 and 100" (PDF), Journal of the American Chemical Society, 76 (24): 6229, Bibcode:1954JAChS..76.6229T, doi:10.1021/ja01653a004, archived from the original (PDF) on 2019-07-10{{citation}}: CS1 maint: multiple names: authors list (link) Radiation Laboratory, University of California, Berkeley, UCRL-2591 <a href="https://web.archive.org/web/20190710170811/http://www.osti.gov/accomplishments/documents/fullText/ACC0047.pdf" target="_blank">https://web.archive.org/web/20190710170811/http://www.osti.gov/accomplishments/documents/fullText/ACC0047.pdf</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></li>
<li id="fn:23">Thompson, S. G.; Harvey, B. G.; Choppin, G. R.; Seaborg, G. T. (1954). "Chemical Properties of Elements 99 and 100". Journal of the American Chemical Society. 76 (24): 6229–6236. Bibcode:1954JAChS..76.6229T. doi:10.1021/ja01653a004. Archived from the original on 2019-10-20. Retrieved 2019-07-14. <a href="https://digital.library.unt.edu/ark:/67531/metadc1023183/" target="_blank">https://digital.library.unt.edu/ark:/67531/metadc1023183/</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></li>
<li id="fn:24">Ghiorso, A.; Thompson, S.; Higgins, G.; Seaborg, G.; Studier, M.; Fields, P.; Fried, S.; Diamond, H.; Mech, J.; Pyle, G.; Huizenga, J.; Hirsch, A.; Manning, W.; Browne, C.; Smith, H.; Spence, R. (1955). "New Elements Einsteinium and Fermium, Atomic Numbers 99 and 100". Phys. Rev. 99 (3): 1048–1049. Bibcode:1955PhRv...99.1048G. doi:10.1103/PhysRev.99.1048. Archived from the original on 2021-05-19. Retrieved 2010-11-24. Seaborg, Glenn Theodore (1994), Modern Alchemy: Selected Papers of Glenn T. Seaborg, World Scientific, ISBN 9789810214401, archived from the original on 2016-04-13 <a href="9789810214401" target="_blank">9789810214401</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></li>
<li id="fn:25">Atterling, Hugo; Forsling, Wilhelm; Holm, Lennart; Melander, Lars; Åström, Björn (1954). "Element 100 Produced by Means of Cyclotron-Accelerated Oxygen Ions". Physical Review. 95 (2): 585–586. Bibcode:1954PhRv...95..585A. doi:10.1103/PhysRev.95.585.2. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></li>
<li id="fn:26">Richard Lee Miller (1991). Under the cloud: the decades of nuclear testing. Two-Sixty Press. p. 115. ISBN 978-1-881043-05-8. <a href="978-1-881043-05-8" target="_blank">978-1-881043-05-8</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></li>
<li id="fn:27">McPhee, John (1980). The Curve of Binding Energy. Farrar, Straus & Giroux Inc. p. 116. ISBN 978-0-374-51598-0. <a href="978-0-374-51598-0" target="_blank">978-0-374-51598-0</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></li>
<li id="fn:28">Ghiorso, A.; Thompson, S.; Higgins, G.; Seaborg, G.; Studier, M.; Fields, P.; Fried, S.; Diamond, H.; Mech, J.; Pyle, G.; Huizenga, J.; Hirsch, A.; Manning, W.; Browne, C.; Smith, H.; Spence, R. (1955). "New Elements Einsteinium and Fermium, Atomic Numbers 99 and 100". Phys. Rev. 99 (3): 1048–1049. Bibcode:1955PhRv...99.1048G. doi:10.1103/PhysRev.99.1048. Archived from the original on 2021-05-19. Retrieved 2010-11-24. Seaborg, Glenn Theodore (1994), Modern Alchemy: Selected Papers of Glenn T. Seaborg, World Scientific, ISBN 9789810214401, archived from the original on 2016-04-13 <a href="9789810214401" target="_blank">9789810214401</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></li>
<li id="fn:29">Ghiorso, Albert (2003). "Einsteinium and Fermium". Chemical and Engineering News. 81 (36): 174–175. doi:10.1021/cen-v081n036.p174. Archived from the original on 2018-09-06. Retrieved 2007-04-15. <a href="/wiki/Albert_Ghiorso" target="_blank">/wiki/Albert_Ghiorso</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></li>
<li id="fn:30">Haire, p. 1577 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></li>
<li id="fn:31">Seaborg, G.T. (1994). Modern alchemy: selected papers of Glenn T. Seaborg. World Scientific. p. 6. ISBN 981-02-1440-5. Archived from the original on 2016-06-09.. <a href="981-02-1440-5" target="_blank">981-02-1440-5</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></li>
<li id="fn:32">Hammond C. R. "The elements" in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton, Florida: CRC Press. ISBN 0-8493-0486-5. <a href="0-8493-0486-5" target="_blank">0-8493-0486-5</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></li>
<li id="fn:33">Haire, R. G. (1990) "Properties of the Transplutonium Metals (Am-Fm)", in: Metals Handbook, Vol. 2, 10th edition, (ASM International, Materials Park, Ohio), pp. 1198–1201. <a href="#fnref:33" class="footnote-back-ref">↩</a></li>
<li id="fn:34">Haire, p. 1591 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></li>
<li id="fn:35">Haire, R. (1986). "Preparation, properties, and some recent studies of the actinide metals". Journal of the Less Common Metals. 121: 379–398. doi:10.1016/0022-5088(86)90554-0. S2CID 97518446. Archived from the original on 2013-05-13. Retrieved 2010-11-24. <a href="https://www.osti.gov/bridge/product.biblio.jsp?osti_id=5235830" target="_blank">https://www.osti.gov/bridge/product.biblio.jsp?osti_id=5235830</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></li>
<li id="fn:36">Greenwood, p. 1268 - Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 978-0080379418. <a href="#fnref:36" class="footnote-back-ref">↩</a></li>
<li id="fn:37">Haire, p. 1579 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></li>
<li id="fn:38">Haire, R. G.; Baybarz, R. D. (1979). "Studies of einsteinium metal" (PDF). Le Journal de Physique. 40: C4–101. doi:10.1051/jphyscol:1979431. S2CID 98493620. Archived (PDF) from the original on 2012-03-07. Retrieved 2010-11-24. draft manuscript Archived 2019-07-10 at the Wayback Machine <a href="http://hal.archives-ouvertes.fr/docs/00/21/88/27/PDF/ajp-jphyscol197940C431.pdf" target="_blank">http://hal.archives-ouvertes.fr/docs/00/21/88/27/PDF/ajp-jphyscol197940C431.pdf</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></li>
<li id="fn:39">Seaborg, p. 61 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></li>
<li id="fn:40">Kleinschmidt, Phillip D.; Ward, John W.; Matlack, George M.; Haire, Richard G. (1984). "Henry's Law vaporization studies and thermodynamics of einsteinium-253 metal dissolved in ytterbium". The Journal of Chemical Physics. 81 (1): 473–477. Bibcode:1984JChPh..81..473K. doi:10.1063/1.447328. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></li>
<li id="fn:41">Seaborg, p. 52 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></li>
<li id="fn:42">Seaborg, p. 60 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></li>
<li id="fn:43">Ensor, D. D.; Peterson, J. R.; Haire, R. G.; Young, J. P. (1981). "Absorption spectrophotometric study of 253EsF3 and its decay products in the bulk-phase solid state". Journal of Inorganic and Nuclear Chemistry. 43 (10): 2425–2427. doi:10.1016/0022-1902(81)80274-6. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></li>
<li id="fn:44">Haire, R. G.; Baybarz, R. D. (1973). "Identification and analysis of einsteinium sesquioxide by electron diffraction". Journal of Inorganic and Nuclear Chemistry. 35 (2): 489–496. doi:10.1016/0022-1902(73)80561-5. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></li>
<li id="fn:45">Seaborg, p. 55 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></li>
<li id="fn:46">Seaborg, p. 76 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></li>
<li id="fn:47">Huray, P.; Nave, S.; Haire, R. (1983). "Magnetism of the heavy 5f elements". Journal of the Less Common Metals. 93 (2): 293–300. doi:10.1016/0022-5088(83)90175-3. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:47" class="footnote-back-ref">↩</a></li>
<li id="fn:48">Huray, Paul G.; Nave, S. E.; Haire, R. G.; Moore, J. R. (1984). "Magnetic Properties of Es2O3 and EsF3". Inorganica Chimica Acta. 94 (1–3): 120–122. doi:10.1016/S0020-1693(00)94587-0. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:48" class="footnote-back-ref">↩</a></li>
<li id="fn:49">Holleman, p. 1956 - Holleman, Arnold F. & Wiberg, Nils (2007). Textbook of Inorganic Chemistry (102nd ed.). Berlin: de Gruyter. ISBN 978-3-11-017770-1. <a href="#fnref:49" class="footnote-back-ref">↩</a></li>
<li id="fn:50">Seaborg, p. 53 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:50" class="footnote-back-ref">↩</a></li>
<li id="fn:51">Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
 <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:51" class="footnote-back-ref">↩</a></li>
<li id="fn:52">Ahmad, I.; Wagner, Frank (1977). "Half-life of the longest-lived einsteinium isotope-252Es". Journal of Inorganic and Nuclear Chemistry. 39 (9): 1509–1511. doi:10.1016/0022-1902(77)80089-4. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:52" class="footnote-back-ref">↩</a></li>
<li id="fn:53">McHarris, William; Stephens, F.; Asaro, F.; Perlman, I. (1966). "Decay Scheme of Einsteinium-254". Physical Review. 144 (3): 1031–1045. Bibcode:1966PhRv..144.1031M. doi:10.1103/PhysRev.144.1031. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:53" class="footnote-back-ref">↩</a></li>
<li id="fn:54">Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
 <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:54" class="footnote-back-ref">↩</a></li>
<li id="fn:55">Institut de Radioprotection et de Sûreté Nucléaire, "Evaluation of nuclear criticality safety data and limits for actinides in transport" Archived 2016-03-06 at the Wayback Machine, p. 16. <a href="https://ec.europa.eu/energy/sites/ener/files/documents/20131018_trm_evaluation.pdf" target="_blank">https://ec.europa.eu/energy/sites/ener/files/documents/20131018_trm_evaluation.pdf</a> <a href="#fnref:55" class="footnote-back-ref">↩</a></li>
<li id="fn:56">John Emsley (2003). Nature's building blocks: an A-Z guide to the elements. Oxford University Press. pp. 133–135. ISBN 0-19-850340-7. Archived from the original on 2016-06-09. <a href="0-19-850340-7" target="_blank">0-19-850340-7</a> <a href="#fnref:56" class="footnote-back-ref">↩</a></li>
<li id="fn:57">Emsley, John (2011). Nature's Building Blocks: An A-Z Guide to the Elements (New ed.). New York, NY: Oxford University Press. ISBN 978-0-19-960563-7. <a href="978-0-19-960563-7" target="_blank">978-0-19-960563-7</a> <a href="#fnref:57" class="footnote-back-ref">↩</a></li>
<li id="fn:58">Gopka, V. F.; Yushchenko, A. V.; Yushchenko, V. A.; Panov, I. V.; Kim, Ch. (2008). "Identification of absorption lines of short half-life actinides in the spectrum of Przybylski's star (HD 101065)". Kinematics and Physics of Celestial Bodies. 24 (2): 89–98. Bibcode:2008KPCB...24...89G. doi:10.3103/S0884591308020049. S2CID 120526363. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:58" class="footnote-back-ref">↩</a></li>
<li id="fn:59">Gopka, V. F.; Yushchenko, Alexander V.; Shavrina, Angelina V.; Mkrtichian, David E.; Hatzes, Artie P.; Andrievsky, Sergey M.; Chernysheva, Larissa V. (2005). "On the radioactive shells in peculiar main sequence stars: the phenomenon of Przybylski's star". Proceedings of the International Astronomical Union. 2004: 734–742. doi:10.1017/S174392130500966X. S2CID 122474778. <a href="https://doi.org/10.1017%2FS174392130500966X" target="_blank">https://doi.org/10.1017%2FS174392130500966X</a> <a href="#fnref:59" class="footnote-back-ref">↩</a></li>
<li id="fn:60">Nothhelfer, S.; Albrecht-Schönzart, Th.E.; Block, M.; Chhetri, P.; Düllmann, Ch.E.; Ezold, J.G.; Gadelshin, V.; Gaiser, A.; Giacoppo, F.; Heinke, R.; Kieck, T.; Kneip, N.; Laatiaoui, M.; Mokry, Ch.; Raeder, S.; Runke, J.; Schneider, F.; Sperling, J.M.; Studer, D.; Thörle-Pospiech, P.; Trautmann, N.; Weber, F.; Wendt, K. (2022). "Nuclear structure investigations of 253−255Es by laser spectroscopy". Physical Review C. 105. doi:10.1103/PhysRevC.105.L021302. S2CID 246603539. <a href="https://doi.org/10.1103%2FPhysRevC.105.L021302" target="_blank">https://doi.org/10.1103%2FPhysRevC.105.L021302</a> <a href="#fnref:60" class="footnote-back-ref">↩</a></li>
<li id="fn:61">"High Flux Isotope Reactor". Oak Ridge National Laboratory. Archived from the original on 2015-02-28. Retrieved 2010-09-23. <a href="http://neutrons.ornl.gov/facilities/HFIR/" target="_blank">http://neutrons.ornl.gov/facilities/HFIR/</a> <a href="#fnref:61" class="footnote-back-ref">↩</a></li>
<li id="fn:62">Радионуклидные источники и препараты (in Russian). Research Institute of Atomic Reactors. Archived from the original on 2020-07-26. Retrieved 2010-09-26. <a href="Радионуклидные источники и препараты" target="_blank">Радионуклидные источники и препараты</a> <a href="#fnref:62" class="footnote-back-ref">↩</a></li>
<li id="fn:63">Haire, p. 1582 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:63" class="footnote-back-ref">↩</a></li>
<li id="fn:64">Greenwood, p. 1262 - Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 978-0080379418. <a href="#fnref:64" class="footnote-back-ref">↩</a></li>
<li id="fn:65">Porter, C. E.; Riley, F. D. Jr.; Vandergrift, R. D.; Felker, L. K. (1997). "Fermium Purification Using Teva Resin Extraction Chromatography". Sep. Sci. Technol. 32 (1–4): 83–92. doi:10.1080/01496399708003188. Archived from the original on 2020-03-11. Retrieved 2018-05-18. <a href="https://zenodo.org/record/1234415" target="_blank">https://zenodo.org/record/1234415</a> <a href="#fnref:65" class="footnote-back-ref">↩</a></li>
<li id="fn:66">Hammond C. R. "The elements" in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton, Florida: CRC Press. ISBN 0-8493-0486-5. <a href="0-8493-0486-5" target="_blank">0-8493-0486-5</a> <a href="#fnref:66" class="footnote-back-ref">↩</a></li>
<li id="fn:67">Hoffman, Darleane C.; Ghiorso, Albert and Seaborg, Glenn Theodore (2000) The Transuranium People: The Inside Story, Imperial College Press, pp. 190–191, ISBN 978-1-86094-087-3. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:67" class="footnote-back-ref">↩</a></li>
<li id="fn:68">Seaborg, pp. 36–37 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:68" class="footnote-back-ref">↩</a></li>
<li id="fn:69">Haire, p. 1582 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:69" class="footnote-back-ref">↩</a></li>
<li id="fn:70">Jones, M.; Schuman, R.; Butler, J.; Cowper, G.; Eastwood, T.; Jackson, H. (1956). "Isotopes of Einsteinium and Fermium Produced by Neutron Irradiation of Plutonium". Physical Review. 102 (1): 203–207. Bibcode:1956PhRv..102..203J. doi:10.1103/PhysRev.102.203. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:70" class="footnote-back-ref">↩</a></li>
<li id="fn:71">Audi, G.; Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001.
 <a href="https://www-nds.iaea.org/amdc/ame2016/NUBASE2016.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2016/NUBASE2016.pdf</a> <a href="#fnref:71" class="footnote-back-ref">↩</a></li>
<li id="fn:72">Guseva, L.; Filippova, K.; Gerlit, Y.; Druin, V.; Myasoedov, B.; Tarantin, N. (1956). "Experiments on the production of einsteinium and fermium with a cyclotron". Journal of Nuclear Energy. 3 (4): 341–346. doi:10.1016/0891-3919(56)90064-X. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:72" class="footnote-back-ref">↩</a></li>
<li id="fn:73">Harry H. Binder: Lexikon der chemischen Elemente, S. Hirzel Verlag, Stuttgart 1999, ISBN 3-7776-0736-3, pp. 18–23. <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:73" class="footnote-back-ref">↩</a></li>
<li id="fn:74">Эйнштейний Archived 2021-05-19 at the Wayback Machine (in Russian, a popular article by one of the involved scientists) <a href="http://n-t.ru/ri/ps/pb099.htm" target="_blank">http://n-t.ru/ri/ps/pb099.htm</a> <a href="#fnref:74" class="footnote-back-ref">↩</a></li>
<li id="fn:75">Chetham-Strode, A.; Holm, L. (1956). "New Isotope Einsteinium-248". Physical Review. 104 (5): 1314. Bibcode:1956PhRv..104.1314C. doi:10.1103/PhysRev.104.1314. S2CID 102836584. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:75" class="footnote-back-ref">↩</a></li>
<li id="fn:76">Harvey, Bernard; Chetham-Strode, Alfred; Ghiorso, Albert; Choppin, Gregory; Thompson, Stanley (1956). "New Isotopes of Einsteinium". Physical Review. 104 (5): 1315–1319. Bibcode:1956PhRv..104.1315H. doi:10.1103/PhysRev.104.1315. Archived from the original on 2020-03-12. Retrieved 2019-07-14. <a href="http://www.escholarship.org/uc/item/462945g3" target="_blank">http://www.escholarship.org/uc/item/462945g3</a> <a href="#fnref:76" class="footnote-back-ref">↩</a></li>
<li id="fn:77">Kulyukhin, S.; Auerman, L. N.; Novichenko, V. L.; Mikheev, N. B.; Rumer, I. A.; Kamenskaya, A. N.; Goncharov, L. A.; Smirnov, A. I. (1985). "Production of microgram quantities of einsteinium-253 by the reactor irradiation of californium". Inorganica Chimica Acta. 110: 25–26. doi:10.1016/S0020-1693(00)81347-X. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:77" class="footnote-back-ref">↩</a></li>
<li id="fn:78">Carter, Korey P.; Shield, Katherine M.; Smith, Kurt F.; Jones, Zachary R.; Wacker, Jennifer N.; Arnedo-Sanchez, Leticia; Mattox, Tracy M.; Moreau, Liane M.; Knope, Karah E.; Kozimor, Stosh A.; Booth, Corwin H.; Abergel, Rebecca J. (3 February 2021). "Structural and spectroscopic characterization of an einsteinium complex". Nature. 590 (7844): 85–88. Bibcode:2021Natur.590...85C. doi:10.1038/s41586-020-03179-3. OSTI 1777970. PMID 33536647. S2CID 231805413. Archived from the original on 3 February 2021. Retrieved 3 February 2021. <a href="https://www.nature.com/articles/s41586-020-03179-3" target="_blank">https://www.nature.com/articles/s41586-020-03179-3</a> <a href="#fnref:78" class="footnote-back-ref">↩</a></li>
<li id="fn:79">Seaborg, p. 39 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:79" class="footnote-back-ref">↩</a></li>
<li id="fn:80">Seaborg, p. 39 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:80" class="footnote-back-ref">↩</a></li>
<li id="fn:81">Seaborg, p. 40 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:81" class="footnote-back-ref">↩</a></li>
<li id="fn:82">These were codenamed: "Anacostia" (5.2 kilotons, 1962), "Kennebec" (<5 kilotons, 1963), "Par" (38 kilotons, 1964), "Barbel" (<20 kilotons, 1964), "Tweed" (<20 kilotons, 1965), "Cyclamen" (13 kilotons, 1966), "Kankakee" (20-200 kilotons, 1966), "Vulcan" (25 kilotons, 1966) and "Hutch" (20-200 kilotons, 1969) <a href="/wiki/TNT_equivalent" target="_blank">/wiki/TNT_equivalent</a> <a href="#fnref:82" class="footnote-back-ref">↩</a></li>
<li id="fn:83">United States Nuclear Tests July 1945 through September 1992 Archived June 15, 2010, at the Wayback Machine, DOE/NV--209-REV 15, December 2000. <a href="http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf" target="_blank">http://www.nv.doe.gov/library/publications/historical/DOENV_209_REV15.pdf</a> <a href="#fnref:83" class="footnote-back-ref">↩</a></li>
<li id="fn:84">Seaborg, p. 40 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:84" class="footnote-back-ref">↩</a></li>
<li id="fn:85">Seaborg, p. 43 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:85" class="footnote-back-ref">↩</a></li>
<li id="fn:86">Seaborg, p. 44 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:86" class="footnote-back-ref">↩</a></li>
<li id="fn:87">Seaborg, p. 47 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:87" class="footnote-back-ref">↩</a></li>
<li id="fn:88">Haire, p. 1583 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:88" class="footnote-back-ref">↩</a></li>
<li id="fn:89">Haire, pp. 1584–1585 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:89" class="footnote-back-ref">↩</a></li>
<li id="fn:90">Hall, Nina (2000). The new chemistry. Cambridge University Press. pp. 9–11. ISBN 978-0-521-45224-3. Archived from the original on 2016-05-20. Retrieved 2016-01-05. <a href="978-0-521-45224-3" target="_blank">978-0-521-45224-3</a> <a href="#fnref:90" class="footnote-back-ref">↩</a></li>
<li id="fn:91">Hall, Nina (2000). The new chemistry. Cambridge University Press. pp. 9–11. ISBN 978-0-521-45224-3. Archived from the original on 2016-05-20. Retrieved 2016-01-05. <a href="978-0-521-45224-3" target="_blank">978-0-521-45224-3</a> <a href="#fnref:91" class="footnote-back-ref">↩</a></li>
<li id="fn:92">Haire, p. 1588 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:92" class="footnote-back-ref">↩</a></li>
<li id="fn:93">Haire, R. (1986). "Preparation, properties, and some recent studies of the actinide metals". Journal of the Less Common Metals. 121: 379–398. doi:10.1016/0022-5088(86)90554-0. S2CID 97518446. Archived from the original on 2013-05-13. Retrieved 2010-11-24. <a href="https://www.osti.gov/bridge/product.biblio.jsp?osti_id=5235830" target="_blank">https://www.osti.gov/bridge/product.biblio.jsp?osti_id=5235830</a> <a href="#fnref:93" class="footnote-back-ref">↩</a></li>
<li id="fn:94">Haire, R. G.; Baybarz, R. D. (1979). "Studies of einsteinium metal" (PDF). Le Journal de Physique. 40: C4–101. doi:10.1051/jphyscol:1979431. S2CID 98493620. Archived (PDF) from the original on 2012-03-07. Retrieved 2010-11-24. draft manuscript Archived 2019-07-10 at the Wayback Machine <a href="http://hal.archives-ouvertes.fr/docs/00/21/88/27/PDF/ajp-jphyscol197940C431.pdf" target="_blank">http://hal.archives-ouvertes.fr/docs/00/21/88/27/PDF/ajp-jphyscol197940C431.pdf</a> <a href="#fnref:94" class="footnote-back-ref">↩</a></li>
<li id="fn:95">Haire, p. 1590 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:95" class="footnote-back-ref">↩</a></li>
<li id="fn:96">Haire, R. G.; Baybarz, R. D. (1973). "Identification and analysis of einsteinium sesquioxide by electron diffraction". Journal of Inorganic and Nuclear Chemistry. 35 (2): 489–496. doi:10.1016/0022-1902(73)80561-5. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:96" class="footnote-back-ref">↩</a></li>
<li id="fn:97">Haire, R. G. & Eyring, L. (1994). "Lanthanides and Actinides Chemistry". In K.A. Gscheidner, Jr.; et al. (eds.). Handbook on the Physics and Chemistry of Rare Earths. Vol. 18. North-Holland, New York. pp. 414–505. ISBN 978-0-444-81724-2.{{cite book}}: CS1 maint: location missing publisher (link) <a href="978-0-444-81724-2" target="_blank">978-0-444-81724-2</a> <a href="#fnref:97" class="footnote-back-ref">↩</a></li>
<li id="fn:98">Haire, R. G. & Eyring, L. (1994). "Lanthanides and Actinides Chemistry". In K.A. Gscheidner, Jr.; et al. (eds.). Handbook on the Physics and Chemistry of Rare Earths. Vol. 18. North-Holland, New York. pp. 414–505. ISBN 978-0-444-81724-2.{{cite book}}: CS1 maint: location missing publisher (link) <a href="978-0-444-81724-2" target="_blank">978-0-444-81724-2</a> <a href="#fnref:98" class="footnote-back-ref">↩</a></li>
<li id="fn:99">Ensor, D. D.; Peterson, J. R.; Haire, R. G.; Young, J. P. (1981). "Absorption spectrophotometric study of 253EsF3 and its decay products in the bulk-phase solid state". Journal of Inorganic and Nuclear Chemistry. 43 (10): 2425–2427. doi:10.1016/0022-1902(81)80274-6. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:99" class="footnote-back-ref">↩</a></li>
<li id="fn:100">Kleinschmidt, P. (1994). "Thermochemistry of the actinides". Journal of Alloys and Compounds. 213–214: 169–172. doi:10.1016/0925-8388(94)90898-2. Archived from the original on 2020-03-16. Retrieved 2019-07-14. <a href="https://digital.library.unt.edu/ark:/67531/metadc1401691/" target="_blank">https://digital.library.unt.edu/ark:/67531/metadc1401691/</a> <a href="#fnref:100" class="footnote-back-ref">↩</a></li>
<li id="fn:101">Fujita, D.; Cunningham, B. B.; Parsons, T. C. (1969). "Crystal structures and lattice parameters of einsteinium trichloride and einsteinium oxychloride". Inorganic and Nuclear Chemistry Letters. 5 (4): 307–313. doi:10.1016/0020-1650(69)80203-5. Archived from the original on 2020-03-13. Retrieved 2019-07-14. <a href="http://www.escholarship.org/uc/item/7hz778j2" target="_blank">http://www.escholarship.org/uc/item/7hz778j2</a> <a href="#fnref:101" class="footnote-back-ref">↩</a></li>
<li id="fn:102">Miasoedov, B. F. Analytical chemistry of transplutonium elements, Wiley, 1974 (Original from the University of California), ISBN 0-470-62715-8, p. 99 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:102" class="footnote-back-ref">↩</a></li>
<li id="fn:103">Fellows, R.; Peterson, J. R.; Noé, M.; Young, J. P.; Haire, R. G. (1975). "X-ray diffraction and spectroscopic studies of crystalline einsteinium(III) bromide, 253EsBr3". Inorganic and Nuclear Chemistry Letters. 11 (11): 737–742. doi:10.1016/0020-1650(75)80090-0. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:103" class="footnote-back-ref">↩</a></li>
<li id="fn:104">Haire, pp. 1595–1596 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:104" class="footnote-back-ref">↩</a></li>
<li id="fn:105">Seaborg, p. 62 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:105" class="footnote-back-ref">↩</a></li>
<li id="fn:106">Haire, pp. 1595–1596 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:106" class="footnote-back-ref">↩</a></li>
<li id="fn:107">Young, J. P.; Haire, R. G.; Peterson, J. R.; Ensor, D. D.; Fellow, R. L. (1981). "Chemical consequences of radioactive decay. 2. Spectrophotometric study of the ingrowth of berkelium-249 and californium-249 into halides of einsteinium-253". Inorganic Chemistry. 20 (11): 3979–3983. doi:10.1021/ic50225a076. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:107" class="footnote-back-ref">↩</a></li>
<li id="fn:108">Greenwood, p. 1268 - Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 978-0080379418. <a href="#fnref:108" class="footnote-back-ref">↩</a></li>
<li id="fn:109">Haire, R. G.; Baybarz, R. D. (1973). "Identification and analysis of einsteinium sesquioxide by electron diffraction". Journal of Inorganic and Nuclear Chemistry. 35 (2): 489–496. doi:10.1016/0022-1902(73)80561-5. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:109" class="footnote-back-ref">↩</a></li>
<li id="fn:110">Haire, p. 1598 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:110" class="footnote-back-ref">↩</a></li>
<li id="fn:111">Haire, R. G. & Eyring, L. (1994). "Lanthanides and Actinides Chemistry". In K.A. Gscheidner, Jr.; et al. (eds.). Handbook on the Physics and Chemistry of Rare Earths. Vol. 18. North-Holland, New York. pp. 414–505. ISBN 978-0-444-81724-2.{{cite book}}: CS1 maint: location missing publisher (link) <a href="978-0-444-81724-2" target="_blank">978-0-444-81724-2</a> <a href="#fnref:111" class="footnote-back-ref">↩</a></li>
<li id="fn:112">Haire, pp. 1595–1596 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:112" class="footnote-back-ref">↩</a></li>
<li id="fn:113">Young, J. P.; Haire, R. G.; Peterson, J. R.; Ensor, D. D.; Fellow, R. L. (1981). "Chemical consequences of radioactive decay. 2. Spectrophotometric study of the ingrowth of berkelium-249 and californium-249 into halides of einsteinium-253". Inorganic Chemistry. 20 (11): 3979–3983. doi:10.1021/ic50225a076. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:113" class="footnote-back-ref">↩</a></li>
<li id="fn:114">Holleman, p. 1969 - Holleman, Arnold F. & Wiberg, Nils (2007). Textbook of Inorganic Chemistry (102nd ed.). Berlin: de Gruyter. ISBN 978-3-11-017770-1. <a href="#fnref:114" class="footnote-back-ref">↩</a></li>
<li id="fn:115">Ensor, D. D.; Peterson, J. R.; Haire, R. G.; Young, J. P. (1981). "Absorption spectrophotometric study of 253EsF3 and its decay products in the bulk-phase solid state". Journal of Inorganic and Nuclear Chemistry. 43 (10): 2425–2427. doi:10.1016/0022-1902(81)80274-6. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:115" class="footnote-back-ref">↩</a></li>
<li id="fn:116">Greenwood, p. 1270 - Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 978-0080379418. <a href="#fnref:116" class="footnote-back-ref">↩</a></li>
<li id="fn:117">Young, J. P.; Haire, R. G.; Fellows, R. L.; Peterson, J. R. (1978). "Spectrophotometric studies of transcurium element halides and oxyhalides in the solid state". Journal of Radioanalytical Chemistry. 43 (2): 479–488. Bibcode:1978JRNC...43..479Y. doi:10.1007/BF02519508. S2CID 95361392. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:117" class="footnote-back-ref">↩</a></li>
<li id="fn:118">Miasoedov, B. F. Analytical chemistry of transplutonium elements, Wiley, 1974 (Original from the University of California), ISBN 0-470-62715-8, p. 99 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:118" class="footnote-back-ref">↩</a></li>
<li id="fn:119">Greenwood, p. 1270 - Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 978-0080379418. <a href="#fnref:119" class="footnote-back-ref">↩</a></li>
<li id="fn:120">Fujita, D.; Cunningham, B. B.; Parsons, T. C.; Peterson, J. R. (1969). "The solution absorption spectrum of Es3+". Inorganic and Nuclear Chemistry Letters. 5 (4): 245–250. doi:10.1016/0020-1650(69)80192-3. Archived from the original on 2020-03-09. Retrieved 2019-07-14. <a href="http://www.escholarship.org/uc/item/3s43w87r" target="_blank">http://www.escholarship.org/uc/item/3s43w87r</a> <a href="#fnref:120" class="footnote-back-ref">↩</a></li>
<li id="fn:121">Seaborg, p. 62 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:121" class="footnote-back-ref">↩</a></li>
<li id="fn:122">Greenwood, p. 1270 - Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. ISBN 978-0080379418. <a href="#fnref:122" class="footnote-back-ref">↩</a></li>
<li id="fn:123">Peterson, J.R.; et al. (1979). "Preparation, characterization, and decay of einsteinium(II) in the solid state" (PDF). Le Journal de Physique. 40 (4): C4–111. CiteSeerX 10.1.1.729.8671. doi:10.1051/jphyscol:1979435. S2CID 95575017. Archived (PDF) from the original on 2012-03-07. Retrieved 2010-11-24. manuscript draft Archived 2013-05-13 at the Wayback Machine <a href="http://hal.archives-ouvertes.fr/docs/00/21/88/31/PDF/ajp-jphyscol197940C435.pdf" target="_blank">http://hal.archives-ouvertes.fr/docs/00/21/88/31/PDF/ajp-jphyscol197940C435.pdf</a> <a href="#fnref:123" class="footnote-back-ref">↩</a></li>
<li id="fn:124">Fellows, R.L.; Young, J.P.; Haire, R.G. and Peterson J.R. (1977) in: GJ McCarthy and JJ Rhyne (eds) The Rare Earths in Modern Science and Technology, Plenum Press, New York, pp. 493–499. <a href="#fnref:124" class="footnote-back-ref">↩</a></li>
<li id="fn:125">Young, J.P.; Haire R.G., Fellows, R.L.; Noe, M. and Peterson, J.R. (1976) "Spectroscopic and X-Ray Diffraction Studies of the Bromides of Californium-249 and Einsteinium-253", in: W. Müller and R. Lindner (eds.) Plutonium 1975, North Holland, Amsterdam, pp. 227–234. <a href="#fnref:125" class="footnote-back-ref">↩</a></li>
<li id="fn:126">Young, J. P.; Haire, R. G.; Peterson, J. R.; Ensor, D. D.; Fellow, R. L. (1981). "Chemical consequences of radioactive decay. 2. Spectrophotometric study of the ingrowth of berkelium-249 and californium-249 into halides of einsteinium-253". Inorganic Chemistry. 20 (11): 3979–3983. doi:10.1021/ic50225a076. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:126" class="footnote-back-ref">↩</a></li>
<li id="fn:127">Seaborg, p. 62 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:127" class="footnote-back-ref">↩</a></li>
<li id="fn:128">Young, J. P.; Haire, R. G.; Peterson, J. R.; Ensor, D. D.; Fellow, R. L. (1981). "Chemical consequences of radioactive decay. 2. Spectrophotometric study of the ingrowth of berkelium-249 and californium-249 into halides of einsteinium-253". Inorganic Chemistry. 20 (11): 3979–3983. doi:10.1021/ic50225a076. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:128" class="footnote-back-ref">↩</a></li>
<li id="fn:129">Peterson, J.R.; et al. (1979). "Preparation, characterization, and decay of einsteinium(II) in the solid state" (PDF). Le Journal de Physique. 40 (4): C4–111. CiteSeerX 10.1.1.729.8671. doi:10.1051/jphyscol:1979435. S2CID 95575017. Archived (PDF) from the original on 2012-03-07. Retrieved 2010-11-24. manuscript draft Archived 2013-05-13 at the Wayback Machine <a href="http://hal.archives-ouvertes.fr/docs/00/21/88/31/PDF/ajp-jphyscol197940C435.pdf" target="_blank">http://hal.archives-ouvertes.fr/docs/00/21/88/31/PDF/ajp-jphyscol197940C435.pdf</a> <a href="#fnref:129" class="footnote-back-ref">↩</a></li>
<li id="fn:130">Young, J. P.; Haire, R. G.; Peterson, J. R.; Ensor, D. D.; Fellow, R. L. (1981). "Chemical consequences of radioactive decay. 2. Spectrophotometric study of the ingrowth of berkelium-249 and californium-249 into halides of einsteinium-253". Inorganic Chemistry. 20 (11): 3979–3983. doi:10.1021/ic50225a076. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:130" class="footnote-back-ref">↩</a></li>
<li id="fn:131">Seaborg, p. 60 - Seaborg, G.T., ed. (23 January 1978). Proceedings of the Symposium Commemorating the 25th Anniversary of Elements 99 and 100 (PDF). Report LBL-7701. <a href="http://www.escholarship.org/uc/item/92g2p7cd.pdf" target="_blank">http://www.escholarship.org/uc/item/92g2p7cd.pdf</a> <a href="#fnref:131" class="footnote-back-ref">↩</a></li>
<li id="fn:132">Haire, p. 1579 - Haire, Richard G. (2006). "Einsteinium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 1577–1620. doi:10.1007/1-4020-3598-5_12. ISBN 978-1-4020-3555-5. Archived from the original (PDF) on 2010-07-17. <a href="https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf" target="_blank">https://web.archive.org/web/20100717154427/http://radchem.nevada.edu/classes/rdch710/files/einsteinium.pdf</a> <a href="#fnref:132" class="footnote-back-ref">↩</a></li>
<li id="fn:133">Nugent, Leonard J.; Burnett, J. L.; Baybarz, R. D.; Werner, George Knoll; Tanner, S. P.; Tarrant, J. R.; Keller, O. L. (1969). "Intramolecular energy transfer and sensitized luminescence in actinide(III) .beta.-diketone chelates". The Journal of Physical Chemistry. 73 (5): 1540–1549. doi:10.1021/j100725a060. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:133" class="footnote-back-ref">↩</a></li>
<li id="fn:134">Beitz, J.; Wester, D.; Williams, C. (1983). "5f state interaction with inner coordination sphere ligands: Es3+ ion fluorescence in aqueous and organic phases". Journal of the Less Common Metals. 93 (2): 331–338. doi:10.1016/0022-5088(83)90178-9. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:134" class="footnote-back-ref">↩</a></li>
<li id="fn:135">It's Elemental – The Element Einsteinium Archived 2019-07-10 at the Wayback Machine. Retrieved 2 December 2007. <a href="http://education.jlab.org/itselemental/ele099.html" target="_blank">http://education.jlab.org/itselemental/ele099.html</a> <a href="#fnref:135" class="footnote-back-ref">↩</a></li>
<li id="fn:136">Ghiorso, A.; Harvey, B.; Choppin, G.; Thompson, S.; Seaborg, G. (1955). "New Element Mendelevium, Atomic Number 101". Physical Review. 98 (5): 1518–1519. Bibcode:1955PhRv...98.1518G. doi:10.1103/PhysRev.98.1518. ISBN 978-981-02-1440-1. Archived from the original on 2016-05-18. Retrieved 2016-01-05. {{cite journal}}: ISBN / Date incompatibility (help) <a href="978-981-02-1440-1" target="_blank">978-981-02-1440-1</a> <a href="#fnref:136" class="footnote-back-ref">↩</a></li>
<li id="fn:137">Schadel, M.; Bruchle, W.; Brugger, M.; Gaggeler, H.; Moody, K.; Schardt, D.; Summerer, K.; Hulet, E.; Dougan, A.; Dougan, R.; Landrum, J.; Lougheed, R.; Wild, J.; O'Kelley, G.; Hahn, R. (1986). "Heavy isotope production by multinucleon transfer reactions with 254Es". Journal of the Less Common Metals. 122: 411–417. doi:10.1016/0022-5088(86)90435-2. Archived from the original on 2020-11-25. Retrieved 2018-10-29. <a href="https://zenodo.org/record/1253958" target="_blank">https://zenodo.org/record/1253958</a> <a href="#fnref:137" class="footnote-back-ref">↩</a></li>
<li id="fn:138">Lougheed, R. W.; Landrum, J. H.; Hulet, E. K.; Wild, J. F.; Dougan, R. J.; Dougan, A. D.; Gäggeler, H.; Schädel, M.; Moody, K. J.; Gregorich, K. E. & Seaborg, G. T. (1985). "Search for superheavy elements using 48Ca + 254Esg reaction". Physical Review C. 32 (5): 1760–1763. Bibcode:1985PhRvC..32.1760L. doi:10.1103/PhysRevC.32.1760. PMID 9953034. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:138" class="footnote-back-ref">↩</a></li>
<li id="fn:139">Turkevich, A. L.; Franzgrote, E. J.; Patterson, J. H. (1967). "Chemical Analysis of the Moon at the Surveyor V Landing Site". Science. 158 (3801): 635–637. Bibcode:1967Sci...158..635T. doi:10.1126/science.158.3801.635. PMID 17732956. S2CID 21286144. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:139" class="footnote-back-ref">↩</a></li>
<li id="fn:140">International Commission on Radiological Protection (1988). Limits for intakes of radionuclides by workers, Part 4. Vol. 19. Elsevier Health Sciences. pp. 18–19. ISBN 978-0-08-036886-3. Archived from the original on 2016-04-25. Retrieved 2016-01-05. <a href="978-0-08-036886-3" target="_blank">978-0-08-036886-3</a> <a href="#fnref:140" class="footnote-back-ref">↩</a></li>
</ol>

Einsteinium open-in-new

Einsteinium