The radioactive decay of a certain substance is measured by a special term known as the half life. However, the final product of radioactive decay is always stable than the initial isotope. The radioactive decay causes an isotope of a particular element to be converted into an isotope of a different element. Therefore, in order to become stable, these isotopes undergo a spontaneous process called radioactive decay. There are certain naturally occurring isotopes that are unstable due to the imbalanced numbers of protons and neutrons they have in their nucleus of atoms.
