The process in which a nucleus spontaneously breaks down by emitting radiation is known as

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Radioactive decay is the specific process of a nucleus spontaneously breaking down by emitting radiation. Transmutation is a more general term that refers to any process in which a nucleus changes into a different nucleus, whether it be through decay or other means. Fusion and transformation are not specific to the process of a nucleus breaking down through radiation emission. A chain reaction involves multiple reactions in which the products of a previous reaction initiate further reactions, and is not exclusively related to radioactive decay.

The Process in Which a Nucleus Spontaneously Breaks Down by Emitting