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
Show Answer
Solution:
- (a) Average atomic mass $=\frac{19 \times 10+81 \times 11}{100}$ $=10.81$