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The law of radioactive decay predicts how the number of the not decayed nuclei of a given radioactive substance decreases in the course of time.
In general terms, fission occurs when a heavy nucleus is vibrating causing it to deform in such a way that it cannot recover and the nucleus breaks in two fission fragments.
Alpha decay is a sort of radioactive decay in which a nucleus releases an alpha particle and it decays in a lighter nucleus with a mass number that is reduced by 4 and an atomic number that is reduced by 2.
Beta decay represents the spontaneous process of radioactive decay of an unstable nuclei with emission of an electron and antineutrino in beta minus decay, a positron and a neutrino in beta plus and with an electron capture for the last possible situation
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