If m, m n and m p are the masses of Z X A nucleus, neutron and proton respectively Options: A . &nbspm B . &nbspm=(A−Z)mn+Zmp C . &nbspm=(A−Z)mp+Zmn D . &nbspm>(A−Z)mn+Zmp

If m, mn and mp are the masses of ZXA nucleus, neutron and proton respectively

Question

If m,

m_{n}

and

m_{p}

are the masses of

_{Z} X^{A}

nucleus, neutron and proton respectively

Options:

A . m

B . m=(A−Z)mn+Zmp

C . m=(A−Z)mp+Zmn

D . m>(A−Z)mn+Zmp

Answer: Option A
:
A
The mass of nucleus formed is always less than the sum of the masses of the constituent protons and neutrons i.e.

m < (A - Z) m_{n} + Z m_{p}

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