What radioactive isotopes are naturally occurring?

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What radioactive isotopes are naturally occurring?

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Answer 1 · 2014-04-06T16:30:37

This is a list of all the naturally occurring elements which either have no stable isotopes, or have at least one naturally occurring isotope that is radioactive.

Potassium $K^{19}$ $K^19$
Technetium $T c^{43}$ $Tc^43$
Cadmium $C d^{48}$ $Cd^48$
Promethium $P m^{61}$ $Pm^61$
Polonium $P o^{84}$ $Po^84$
Astatine $A t^{85}$ $At^85$
Radon $R n^{86}$ $Rn^86$
Francium $F r^{87}$ $Fr^87$
Radium $R a^{86}$ $Ra^86$
Actinium $A c^{89}$ $Ac^89$
Uranium $U^{92}$ $U^92$

93-118 are not naturally occurring but are radioactive.
110-118 have not been named yet.

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What radioactive isotopes are naturally occurring?

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