What is Radioactivity? - QS Study
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The phenomenon of spontaneous disintegration of certain atomic nuclei resulting in the emission of radioactive rays is called radioactivity.

Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability. The decomposition process is called radioactivity. Radioactivity is a nuclear phenomenon and it is not affected by external factors such as temperature, pressure etc. This phenomenon was discovered by Henry Becqurel.