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Mn and Mp represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be 


  1. M>[NMn+ZMp]

  2. M=[NMn+ZMp]

  3. M=N[Mn+Mp]

  4. M<[NMn+ZMp]


Solution

The correct option is D

M<[NMn+ZMp]


Actual mass of the nucleus is always less than total mass of nucleons. So, M<[NMn+ZMp]

The difference in mass is called mass defect.

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