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26 May, 23:14

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

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  1. 26 May, 23:16
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    11, the numbers of protons and electrons are always equal in an atom, the numbers of protons tell us about atomic number of element

    mass number=no. of P+no. of N

    here, 24

    no. of P (atomic number) = 24-13=11
  2. 26 May, 23:41
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    A=Mass number=24

    N=neutrons=13

    Z=atomic number.

    A=Z+N

    24=Z+13

    Z=24-13

    Z=11

    The atomic number is 11, and this atom is sodium.
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