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19 June, 21:54

How many neutrons does element x have if its atomic number is 39 and its mass number is 84?

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Answers (2)
  1. 19 June, 22:50
    0
    Yttrium is the answer
  2. 20 June, 01:14
    0
    There are 45 neutrons

    try subtracting the atomic number by the mass number.
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