It is, in essence, an attribute of individual atomic nuclei.Īn unstable nucleus will decompose spontaneously, or decay, into a more stable configuration but will do so only in a few specific ways by emitting certain particles or certain forms of electromagnetic energy. Radioactivity, property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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