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Bromine has only two natural isotopes, and they occur in about equal abundance. Part A If 79Br is one of the isotopes, what is the other isotope given the atomic mass of bromine is approximately 80 amu ? Express your answer as an isotope.

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Given that 79Br is one of the isotopes of bromine and they occur in about equal abundance, the other isotope must be 81Br to account for the atomic mass of approximately 80 amu.
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User JefGli
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