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Reference.org
List of elements by stability of isotopes
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<p>Of the first 82 <a href="/facts/Chemical_elements/0jducgWD">chemical elements</a> in the <a href="/facts/Periodic_table/umdGIfUb">periodic table</a>, 80 have <a href="/facts/Isotope/KD9B1y6o">isotopes</a> considered to be stable. Overall, there are 251 known stable isotopes in total. </p>