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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?
100% Bromine-79 and 0% Bromine-81.
90% Bromine-79 and 10% Bromine-81.
50% Bromine-79 and 50% Bromine-81.
25% Bromine-79 and 75% Bromine-81.