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Chemistry, 22.09.2021 14:00 demetricejames

Element X has two isotopes. If 72.0% of the element has an isotope mass of 84.9 atomic mass units, and 28.0% of the element has an isotopic mass of 87.0 atomic mass units, the average atomic mass of element X is numerically equal to

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Element X has two isotopes. If 72.0% of the element has an isotope mass of 84.9 atomic mass units, a...

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