When is an isotope considered stable?
(select all that apply.)

Explanation:

A stable isotope is one that does not emit radiation, or, if it does its half-life is too long to have been measured. It is believed that the stability of the nucleus of an isotope is determined by the ratio of neutrons to protons.

Hope this helps you out : D

it is stable as it is in group 0 which have full outer shells of electrons