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Tritium, 13H, cannot decay by alpha decay because it only has one proton, and an alpha particle has two protons, along with its two neutrons. The lightest nuclide capable of alpha decay is lithium-5, 35Li, decaying by alpha decay to ordinary hydrogen, 11H.

13H decays by beta- decay to 23He, a rare form of helium, which is then stable.

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Related Questions

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