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14 February, 16:33

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

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Answers (2)
  1. 14 February, 17:54
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    That would be 21 neutrons (34-13=21).

    Atom mass is the number of protons+number of neutrons.
  2. 14 February, 19:56
    0
    =21 neutrons

    Explanation:

    The atomic mass of an atom is the total sum of the contents of the nucleus (protons and neutrons).

    Thus atomic mass = no. of neutrons + no. of protons

    Number of protons = The atomic mass-number of protons

    = 34 - 13 = 21
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