if bromine atom is available in the form of two isotope 79br35 and 81br35 is 49.7%and 59.3% respectively.
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this m8 be ur qstn's answer...!
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_/\_Hello mate__here is your answer--
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The average atomic mass of bromine
={ (79 x 49.7)+ (81 x 50.3) }/100
= (3926.3 + 4074.3)/100
= 8000.6/100
= 80 u
I hope, this will help you.☺
Thank you______❤
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