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Isotopes of radon

There are 39 known isotopes of radon (86Rn), from 193Rn to 231Rn; all are radioactive. The most stable isotope is 222Rn with a half-life of 3.8235 days, which decays into 218Po. Six isotopes of radon, 217, 218, 219, 220, 221, 222Rn, occur in trace quantities in nature as decay products of, respectively, 217At, 218At, 223Ra, 224Ra, 225Ra, and 226Ra. 217Rn and 221Rn are produced in rare branches in the decay chain of trace quantities of 237Np; 222Rn (and also 218Rn in a rare branch) is an intermediate step in the decay chain of 238U; 219Rn is an intermediate step in the decay chain of 235U; and 220Rn occurs in the decay chain of 232Th.

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List of isotopes

Nuclide2HistoricnameZNIsotopic mass (Da)345Half-lifeDecaymodeDaughterisotopeSpin andparity67Isotopicabundance
Excitation energy8
193Rn86107193.009708(27)1.15(27) msα189Po(3/2−)
194Rn86108194.006146(18)0.78(16) msα190Po0+
β+?194At
195Rn86109195.005422(55)7(3) msα191Po3/2−
195mRn980(50) keV6(3) msα191Po13/2+
196Rn86110196.002120(15)4.7(11) msα192Po0+
β+?196At
197Rn86111197.001621(17)54(6) msα193Po3/2−
β+?197At
197mRn199(11) keV25.6(25) msα193Po13/2+
β+?197At
198Rn86112197.998679(14)64.4(16) msα (93%)194Po0+
β+? (7%)198At
199Rn86113198.9983254(78)590(30) msα195Po3/2−
β+?199At
199mRn220(11) keV310(20) msα195Po13/2+
β+?199At
IT?199Rn
200Rn86114199.9957053(62)1.09(16) sα (92%)196Po0+
β+? (8%)200At
200mRn2320(20)# keV28(9) μsIT200Rn
201Rn86115200.995591(11)7.0(4) sα197Po3/2−
β+?201At
201mRn245(12) keV3.8(1) sα197Po13/2+
β+?201At
202Rn86116201.993264(19)9.7(1) sα (78%)198Po0+
β+ (22%)202At
202mRn2310(50)# keV2.22(7) μsIT202Rn11−#
203Rn86117202.9933612(62)44.2(16) sα (66%)199Po3/2−
β+ (34%)203At
203mRn362(4) keV26.9(5) sα (75%)199Po13/2+
β+ (25%)203At
204Rn86118203.9914437(80)1.242(23) minα (72.4%)200Po0+
β+ (27.6%)204At
205Rn86119204.9917232(55)170(4) sβ+ (75.4%)205At5/2−
α (24.6%)201Po
205mRn657.1(5) keV>10 sIT205Rn13/2+#
α?201Po
β+?205At
206Rn86120205.9901954(92)5.67(17) minα (62%)202Po0+
β+ (38%)206At
207Rn86121206.9907302(51)9.25(17) minβ+ (79%)207At5/2−
α (21%)203Po
207mRn899.1(10) keV184.5(9) μsIT207Rn13/2+
208Rn86122207.989635(11)24.35(14) minα (62%)204Po0+
β+ (38%)208At
208mRn1828.3(4) keV487(12) nsIT208Rn8+
209Rn86123208.990401(11)28.8(10) minβ+ (83%)209At5/2−
α (17%)205Po
209m1Rn1174.01(13) keV13.4(13) μsIT209Rn13/2+
209m2Rn3636.81(23) keV3.0(3) μsIT209Rn35/2+
210Rn86124209.9896889(49)2.4(1) hα (96%)206Po0+
β+ (4%)210At
210m1Rn1710(30) keV644(40) nsIT210Rn8+
210m2Rn3857(30) keV1.06(5) μsIT210Rn17−
210m3Rn6514(30) keV1.04(7) μsIT210Rn23+
211Rn86125210.9906008(73)14.6(2) hβ+ (72.6%)211At1/2−
α (27.4%)207Po
211m1Rn1603(14)# keV596(28) nsIT211Rn17/2−
211m2Rn8905(20)# keV201(4) nsIT211Rn63/2−
212Rn86126211.9907039(33)23.9(12) minα208Po0+
212m1Rn1639.68(15) keV118(14) nsIT212Rn6+
212m2Rn1694.1(3) keV910(30) nsIT212Rn8+
212m3Rn6174.2(3) keV102(4) nsIT212Rn22+
212m4Rn8579.2(4) keV154(14) nsIT212Rn30+
213Rn86127212.9938851(36)19.5(1) msα10209Po9/2+#
213m1Rn1682(10) keV1.00(21) μsIT213Rn(25/2+)
213m2Rn2205(10) keV1.36(7) μsIT213Rn(31/2−)
213m3Rn5965(14) keV164(11) nsIT213Rn(55/2+)
214Rn86128213.9953627(99)259(3) nsα210Po0+
214mRn4595.4(18) keV245(30) nsIT214Rn(22+)
215Rn86129214.9987450(65)2.30(10) μsα211Po9/2+
216Rn86130216.0002719(62)29(4) μsα212Po0+
217Rn86131217.0039276(45)593(38) μsα213Po9/2+Trace11
218Rn86132218.0056011(25)33.75(15) msα214Po0+Trace12
219Rn13ActinonActinium emanation86133219.0094787(23)3.96(1) sα215Po5/2+Trace14
220RnThoronThorium emanation86134220.0113924(19)55.6(1) sα15216Po0+Trace16
221Rn86135221.0155356(61)25.7(5) minβ− (78%)221Fr7/2+Trace17
α (22%)217Po
222Rn18Radon19Radium emanationEmanationEmanonNiton86136222.0175760(21)3.8215(2) dα20218Po0+Trace21
223Rn86137223.0218893(84)24.3(4) minβ−223Fr7/2+
α?22219Po
224Rn86138224.024096(11)107(3) minβ−224Fr0+
225Rn86139225.028486(12)4.66(4) minβ−225Fr7/2−
226Rn86140226.030861(11)7.4(1) minβ−226Fr0+
227Rn86141227.035304(15)20.2(4) sβ−227Fr(3/2+)
228Rn86142228.037835(19)65(2) sβ−228Fr0+
229Rn86143229.042257(14)11.9(13) sβ−229Fr(5/2+)
230Rn86144230.04527(22)#24# s[>300 ns]β−?230Fr0+
231Rn86145231.04997(32)#2# s[>300 ns]β−?231Fr1/2+#
This table header & footer:
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References

  1. "Decay Chain". https://www-nds.iaea.org/relnsd/vcharthtml/decaychain.html#NUCID=238U

  2. mRn – Excited nuclear isomer. /wiki/Nuclear_isomer

  3. Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf. /wiki/Doi_(identifier)

  4. ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

  5. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

  6. ( ) spin value – Indicates spin with weak assignment arguments.

  7. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

  8. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

  9. Order of ground state and isomer is uncertain.

  10. Theoretically capable of electron capture to 213At[4]

  11. Intermediate decay product of 237Np /wiki/Neptunium-237

  12. Intermediate decay product of 238U /wiki/Decay_product

  13. Theoretically capable of β− decay to 219Fr

  14. Intermediate decay product of 235U /wiki/Uranium-235

  15. Theoretically capable of β−β− decay to 220Ra

  16. Intermediate decay product of 232Th /wiki/Thorium-232

  17. Intermediate decay product of 237Np /wiki/Neptunium-237

  18. Most common isotope

  19. Source of element's name

  20. Theoretically capable of β−β− decay to 222Ra and perhaps β− decay to 222Fr[5]

  21. Intermediate decay product of 238U /wiki/Decay_product

  22. Theoretically capable of α decay with a partial half-life of ~3.65×108 seconds (~11.6 years; branching ratio ~4×10−4%).[6][7]