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$m_{p}$ and $m_{n}$ are masses of proton and neutron respectively. An element of mass $M$ has $Z$ protons and $N$ neutrons then
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Verified Answer
The correct answer is:
$M < Z m_{p}+N m_{n}$
When a nucleus is formed, then the mass of nucleus is slightly less than the sum of the mass of $Z$ protons and $N$ neutrons.
ie,
$$
M < \left(Z m_{p}+N m_{n}\right)
$$
ie,
$$
M < \left(Z m_{p}+N m_{n}\right)
$$
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