$M_{n}$ and $M_{p}$ 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

$M < [N M_{n} + Z M_{p}]$

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$M > [N M_{n} + Z M_{p}]$

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$M = [N M_{n} + Z M_{p}]$

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$M = N [M_{n} + M_{p}]$

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Solution

The correct option is A
$M < [N M_{n} + Z M_{p}]$

Actual mass of the nucleus is always less than total mass of nucleons. So, $M < [N M_{n} + Z M_{p}]$

The difference in mass is called mass defect.

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