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14 August, 14:35

What is the atomic mass of an atom with 9 protons 11 neutrons and 9 electrons

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  1. 14 August, 15:16
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    20 amu.

    Explanation:

    Atomic mass = protons + neutrons

    = 9 + 11

    = 20 amu

    The atomic number = number of protons in it = 9.
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