Radioisotopes have stable nuceli?

Question

true or false details please

Answer 1

No, a radioisotope (or radionuclide) is an atom with a unstable nucleus and as such has excess energy. It gets rid of this energy by gamma radiation, beta particle or alpha particle.

It can be categorised as a primordial radionuclide (which originate from the interior of a star), secondary radionuclide (created by the decay of a primordial radionuclide) and artificially-produced radionuclide which are created by nuclear reactors.

Answer 2

false by definition. radioisotopes have unstable nuclei that undergo radioactive decay, hence the name.