"Bismuth has long been considered the element with the highest atomic mass that is stable. However, in 2003 it was discovered to be weakly radioactive: its only primordial isotope, bismuth-209, decays via alpha decay with a half life more than a billion times the estimated age of the universe." From Wikipedia, sourced to Dumé, Belle (23 April 2003). "Bismuth breaks half-life record for alpha decay". Physicsworld.
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