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A stable isotope is a form of an element which is not radioactive.
Most elements from hydrogen to lead have both stable and radioactive isotopes with exception of technetium, tungsten and promethium).
All elements heavier than lead, beginning with bismuth, are only found in radioactive isotopes. Note some elements (like potassium or tungsten) do have naturally occurring isotopes which are very slightly radioactive; these isotopes have been excluded from this list, which strictly limits to entirely (as far as it is known) stable entities. •
No elements with an atomic number greater than 82 have any naturally occurring stable isotopes.
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