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6 May, 11:43

How many neutrons does element X have if its atomic number is 46 and its mass number is 159

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Answers (2)
  1. 6 May, 11:54
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    Mass number: Sum of protons and neutrons

    Atomic number: Number of protons

    159-46=113
  2. 6 May, 13:01
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    The atomic mass is neutrons+protons so to find neutrons, we just do:

    159-46=113

    So it has 113 neutrons.
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