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Boron has two stable isotopes, .^(10)B(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 is

A

10.8

B

10.2

C

11.2

D

10

Text Solution

Verified by Experts

The correct Answer is:
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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