Question

what is radioactivity​

Answer 1

Explanation:

Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles or photons. 

Answer 2

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Radioactivity is the process of emission of radioactive rays from radioactive elements.

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