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A hypothetical element has three main iso-
topes with mass numbers of 77, 79, and 80.
If 15.00% of the isotopes have a mass number
of 77 amu and 30.00% of the isotopes have a
mass of 79 amu, what atomic weight should be
listed on the periodic table for this element?
1. 78.67 amu
2. 62.25 amu
es
3. 61.65 amu

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