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Atomic weight and molecular weight - class-XII
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Boron has two stable isotopes, $^{10}B (19\%)$ and $^{11}B(81\%)$. Average atomic weight for boron in the periodic table is:
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A
10.8
💡 Explanation:
Average atomic weight $=\dfrac{ \sum \%abundant \times atomic\ mass}{100}$
$=\dfrac{ 19 \times 10 + 81 \times 11}{100}=10.81$
Option B is the answer.