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The average atomic mass of bromine is 79.90 amu. Bromine consists of two isotopes: Bromine-79 and Bromine-81.

Which of the following is the BEST approximate relative abundance of these two isotopes?

A

100% Bromine-79 and 0% Bromine-81.

B

90% Bromine-79 and 10% Bromine-81.

C

50% Bromine-79 and 50% Bromine-81.

D

25% Bromine-79 and 75% Bromine-81.

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