What is meant by radioactivity?
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Radioactive 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.
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radioactivity noun
ra·dio·ac·tiv·i·ty | \ ˌrā-dē-ō-ak-ˈti-və-tē \
Definition of radioactivity
: the property possessed by some elements (such as uranium) or isotopes (such as carbon 14) of spontaneously emitting energetic particles (such as electrons or alpha particles) by the disintegration of their atomic nuclei
also : the rays emitted
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