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If the atomic number of an element is 11 and its mass number is 23, then what is the number of neutrons in its nucleus?

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If the atomic number of an element is 11 and its mass number is 23, then what is the number of neutrons in its nucleus?

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Atomic mass of sodium atom is 23 and its atomic number is 11. 

Hence a number of neutrons (N) will be 23 - 11 = 12.

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