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Nuclear Chemistry: Crash Course Chemistry #38

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Fusion means combining lighter atomic nuclei to form a heavier nucleus. ... The reverse reaction, in which a heavy nucleus splits into lighter nuclei, is called nuclear fission

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Fission is the splitting of a heavy nucleus into lighter nuclei and fusion is the combining of nuclei to form a bigger and heavier nucleus.

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A radioactive process in which an atomic nucleus loses energy by emitting a gamma ray (a stream of high-energy photons).

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Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.

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Radioactive decay in which an electron is emitted.

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Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, or a gamma ray or electron in the case of internal conversion