Consider the following three atoms: Ar (protons = 18, neutrons = 21, atomic mass = 38.964313 u), K (protons = 19, neutrons = 20, atomic mass = 38.963707 u), and Ca (protons = 20, neutrons = 19, atomic mass = 38.970719 u). Which one is stable? How will the others decay? Will any of these nuclei decay by electron capture but not by B+ decay?

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