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When nucleons join to form a stable nucleus, mass is

When nucleons join to form a stable nucleus, mass is

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When nucleons, that is protons and neutrons, join to form a stable nucleus, the mass is decreased, or, in other words, the mass of the nucleus so formed is always less than the sum total mass of the nucleons joined to form the nucleus. This difference is called the mass defect and according to Einstein's mass energy equivallence, this difference in mass is converted in to equivalent amount of energy as given by

E = m c2

Which is relesed during formation of the nucleus.

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