1.

Boron has two stable isotopes, `.^(10)B(19%)` and `.^(11)B(81%)`. The atomic mass that should appear for boron in the periodic table isA. 10.8B. 10.2C. 11.2D. 10

Answer» Correct Answer - A
Average of atomic weight
`(% of ^(10)Bxx"atoms mass of"^(10)B+%of^(11)Bxx"atomic mass of"^(11)B)/(%of^(10)B+%of^(11)B)`
`=(19xx10+81xx11)/(19+81)`
`=(190+891)/(100)=10.81`


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