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27 August, 07:34

How many neutrons does element X have if its atomic number is 39 and its mass number is 79?

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  1. 27 August, 10:05
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    Number of neutrons: atomic mass - atomic number

    Element X's atomic mass is 79 and its atomic number is 39. Subtract 39 from 79 to find how many neutrons Element X has.

    79 - 39 = 40

    Element X has 40 neutrons.
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