An element ‘X’ has mass number 27. If the number of electrons is given as 13, the number of neutrons is:

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Solution

The correct option is B
14

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, number of protons is 13, as the number of electrons is 13.
So, number of neutrons is 27 – 13 = 14

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An element ‘X’ has mass number = 27. If the number of electrons is given as 13, the number of neutrons will be _____.

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

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