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9 November, 00:45

An atom has a mass number of 24 and 13 neutrons. What is the atomic number of this atom? Express

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  1. 9 November, 00:46
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    A=mass number (protons + neutrons)

    Z=atomic number (protons)

    N=number of neutrons.

    A=Z+N

    dа ta:

    A=24

    N=13

    Therefore:

    24=Z+13

    Z=24-13=11

    Answer: The atomic number of this atom is 11. (The element is sodium)
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