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   [CBSE PMT 1990]

A.        10.8       
B.        10.2
C.        11.2       
D.        10.0
Answer» B.        10.2


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