Explanation

(b) In order to compare the stability of the nuclei of different atoms we determine the binding energy per nucleon. Higher the binding energy per nucleon. More stable is the nucleus. A graph between energy per nucleon and the mass number of nuclei is called the binding energy curve. It gives the following information that of two or more very light nuclei (nucleus of heavy hydrogen $\ _{1}H^{2}\ $fuse into a relatively heavier nucleus $(\ _{2}He^{4}),$ then binding energy will increase showing that helium is stable.
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