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22 October, 15:29

How many neurons does elements X have if's atomic number is 21 and its mass number is 76

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  1. 22 October, 17:25
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    The element has 55 neutrons.

    Explanation:

    mass number = A = 76

    atomic number = Z = 21

    Mass number is the sum of number of protons and neutrons present in a nucleus while as the atomic number is the number of protons present in a nucleus.

    so the number of neutrons = Mass number - Atomic number

    n = A-Z

    n=76-21

    n = 55
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