Maker
Most folk just call me; Orange Joe
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Look at this list of radioactive isotopes by half life. For reference, the predicted age of the universe is about 13*10^9 so everything below uranium 238 has a half life longer than the age of the universe, there's quite a few of them.Your post interested me, so i looked some stuff up, and came across this -
You have to wonder as to definitions sometimes. At the absolute, it appears that Bismuth is unstable. But, then there's that "half life of more than 1 billion times the estimated age of the universe" comment!