An element 'X’ with mass number of 27 has 14 neutrons. How many electrons does X have?

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Solution

The correct option is C 13
Mass number = number of protons + number of neutrons

That is, 27 = number of protons + 14

Number of protons = 27 – 14 = 13

Since, for a neutral atom, number of protons = number of electrons

Hence, number of electrons = 13

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