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That's a very vague question, but if it's the theory you're after;

If a nucleus is heavy (>82 protons, generally at A2 level) it will emit an alpha particle. For example,

238U --> 234Th + 4α + 0νe

_92______76___ 2___0

In this emission, Uranium-238 is the parent nucleus. It emits an alpha particle, which has 2 protons and 2 neutrons. Thallium-234 is the daughter nucleus. The other thing is a neutrino. It is a lepton, and is there to balance the lepton number.

Apologies for the big black line, but it's the only way I could get wikians to play nicely.

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