Question

what is radioactive elements

Answer 1

those elements which unstable and break to realese energy is called radioactive elements

Answer 2

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

A radioactive element is a fundamental element whose atomic nuclei demonstrates the phenomenon of radioactivity. The name ‘radioactive’ may suggest to you that radioactive elements radiate radio waves, but unfortunately that is not so! The name ‘radioactivity’ is a misnomer because these elements have nothing to do with radio waves!