Mass defect.

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It has been observed that the mass of a stable nucleus is less than sum of masses of the constituent nucleons (proton & neutrons). 
         I.e
      Real nuclear mass, M<(Zmp+Nmn)
The difference between the sum of the masses of nucleons constituting the nucleus and real mass of nucleus is known as mass defect.
★ Mass defect, ∆m=[(Zmp+Nmn)]–M
    Where, mp=mass of proton
                mn=mass of neutron
                Z=number of protons
                M=mass of nucleus
                N=number of neutrons

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