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Atomic Mass and Mass Number

mp and mn a...

Question

$m_{p}$ and $m_{n}$ are masses of proton and neutron respectively. An element of mass $M$ has $Z$ protons and $N$ neutrons then:

M > Z m_{p} + N m_{n}

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M = Z m_{p} + N m_{n}

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M < Z m_{p} + N m_{n}

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M

may be greater than less than or equal to

Z m_{p} + N m_{n}

, depending on nature of element

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Solution

The correct option is C $M < Z m_{p} + N m_{n}$
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
i.e. $M < (Z m_{p} + N m_{n})$

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