Atoms of the same element that differ in number of neutrons
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Deuterium is an isotope of hydrogen that contains one proton and one neutron. It is commonly referred to as "heavy hydrogen" due to its higher atomic mass compared to regular hydrogen, which has no neutrons.
The radioactive isotope is disintegrated in time and emit radiations.
The process in which one isotope changes to another isotope is called radioactive decay. During this process, the unstable nucleus of an isotope emits radiation in the form of alpha particles, beta particles, or gamma rays to transform into a more stable isotope. The rate at which radioactive decay occurs is measured by the isotope's half-life.
The parent isotope is the original radioactive isotope that undergoes decay to form the daughter isotope. The daughter isotope is the stable isotope that is formed as a result of the radioactive decay of the parent isotope.
it must eject the extra nucleons and should be conveted into a stable isotope.