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Why the mass of the nucleus is less than...

Why the mass of the nucleus is less than the sum of masses of the nucleons?

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In the formation of the nucleus, the neutrons and protons have to collect in a very small space whos size of the order of `10^(-15)m`. The energy required for this purpose is spent by the nucleons at the cost of their masses. As a result of this, the mass of the nucleus formed becomes less than the sum of the masses of the individual nucleons.
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