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11 April, 07:29

How many neutrons does element X have if its atomic number is 57 and its mass number is 168?

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Answers (2)
  1. 11 April, 07:52
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    Mass number is number of protons + number of neutrons

    168 - 57 = Answer

    Answer = 111
  2. 11 April, 07:58
    0
    Mass number is # of protons + # of neutrons

    since the atomic number is the number of protons, the number of protons is 57

    so 168 = 57 + x

    x = 111 neutrons
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