An element ‘X’ has atomic mass number = 27. If the number of electrons = 13. The number of neutrons will be _____.

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Solution

The correct option is B
14

Atomic mass number = number of protons + number of neutrons
Since an atom is neutral, number of protons = number of electrons, which is necessary for charge balance.

Thus the number of protons = 13, since number of electrons = 13.
So number of neutrons will be 27 – 13 = 14

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