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Do all atoms decay? I know "radioactive" atoms do of course, but I don't really understand how some atoms could decay, while others don't.
Answer 1:

I believe that most atoms are pretty stable. The ones that do decay (radioactive) usually have some sort of imbalance between the number of protons and neutrons in the nucleus and the energetics inside the nucleus are such that it is relatively easy for it to break apart.




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