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21 November, 11:06

How many neutrons does element x have if its atomic number is 54 and its mass number is 151?

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  1. 21 November, 13:31
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    Atomic mass (z) - atomic number / # of protons (n) = # of neutrons:

    151-54=97

    You can easily tell what element X is. With an atomic number of 54, the element is the noble gas Xenon (Xe).
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