Some Basic Concepts of Chemistry - Result Question 28

####27. Boron has two stable isotopes, ${ }^{10} B(19 %)$ and ${ }^{11} B(81 %)$. Average atomic weight for boron in the periodic table is

[1990]

(a) 10.8

(b) 10.2

(c) 11.2

(d) 10.0

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Solution:

  1. (a) Average atomic mass $=\frac{19 \times 10+81 \times 11}{100}$ $=10.81$


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