Question

What is meant by radioactivity ?​

Answer 1

Answer:

As its name implies, radioactivity is the act of emitting radiation spontaneously. This is done by an atomic nucleus that, for some reason, is unstable; it "wants" to give up some energy in order to shift to a more stable configuration.

Answer 2

$\sf \huge \underline{answer} \implies$

Radioactivity is the result of the decay of the nucleus. The rate of decay of the nucleus is independent of temperature and pressure. Radioactivity is dependent on the law of conservation of charge. The physical and chemical properties of the daughter nucleus are different from the mother nucleus.