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27 October, 08:58

The mass number of a nucleus (except Hydrogen) is:

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  1. 27 October, 12:54
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    The mass number of a nucleus (except Hydrogen) is: number of protons + number of neutrons.

    A=Z+N

    A=mass number=protons + neutrons.

    Z=atomic number=number of protons.

    N=number of neutrons.

    In the case of Hydrogen it depends of isotope of Hydrogen.

    the hydrogen has three isotopes,

    protium : A=Z, because N=0

    deuterium: A=Z+N; N=1

    tritium: A=Z+N; N=2
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