What is the heaviest stable or metastable nucleus?
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Hi,
The heaviest stable nucleus that we know of is Lead-207,with 82 protons and 125 neutrons.
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The heaviest stable nucleus that we know of is Lead-207,with 82 protons and 125 neutrons. It was thought that the most common isotope of Bismuth, Bi-209 was stable but it decays, though it's half-life of 1.9x10^19 years is much longer than the age of the universe.
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