Let 
be the mass of a proton, 
the mass of a neutron, 
the mass of a 
nucleus and 
the mass of a 
nucleus. Then
A
B
C
D
Text Solution
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(c, d)
Due to mass defect (which is finally responsible for the binding energy of the nucleus), mass of a nucleus is always less then the sum of masses of it's constituent particles 
is made up of 10 protons plus 10 neutrons. Therefore, mass of 
nucleus 
Also heavier the nucleus, more is he mass defect thus 
or
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