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in nature, 51% of bromine atoms are bromine-79 and the other 49% are bromine-81. what is the mass number for each of these isotopes
7 years ago

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bobpursley
Huh? The mass numbers are 79, and 81.
the avg atomic mass will be .51*79+.49*81

Are you proofing your typing? Your question makes no sense.
7 years ago

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