Question

what are radioactive isotopes

Answer 1

radioactive isotopes are those elements which produces alpha , beta and gamma rays.

Answer 2

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

A radioactive isotope, also known as a radioisotope, radionuclide, or radioactive nuclide, is any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays.