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Boron has two isotopes, B-10 and B-11. T...

Boron has two isotopes, B-10 and B-11. The average atomic mass of boron is found to be 10.80u. Calculate the percentage of abundance of these isotopes.

A

B-10=80% , B-11=20%

B

B-10=40 % , B-11=60%

C

B-10=20 % , B-11=80%

D

B-10=70 % , B-11=30%

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