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If bromine atom is available in the form of, say two isotopes (79,35)Br(49.7%) and (81,35)Br(50.3%),

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If bromine atom is available in the form of, say two isotopes 7935Br(49.7%) and 8135Br(50.3%), calculate the average atomic mass of bromine atom.

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% of Br (79) = 49.7 ; % of Br (81) = 50.3

Atomic mass of Br 

Thus, atomic mass of bromine is 80.0

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