Q. 104.7( 24 Votes )
We know that upper digit in the symbol of an isotope represents its mass (which is the same as its mass number). Now:
(i) The mass of isotope is 79 u and its abundance is 49.7%.
(ii) The mass of isotope is 81 u and its abundance is 50.3%.
So, Average atomic mass of bromine = 79 ×
= 39.263 + 40.743
Thus, the average atomic mass of bromine is 80 u.
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