Question

What do you mean by radioactivity

Answer 1

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation

Answer 2

radioactivity decay is the process in which an unstable atomif nucloes 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 conversation.