Question

Relative abundance (in percentage) of ${ }^{14} C$ isotope is

• A. $1.1$
• B. $2 \times 10^{-10}$
• C. $2 \times 10^{-4}$
• D. $2 \times 10^{-5}$

Answer 1

Answer: (B)

Carbon has mainly three isotopes. $C - 12, C -13$ and $C - 14 . C - 14$ is a radioactive isotope of carbon and present in least quantity, i.e. near about $\left(2 \times 10^{-10}\right)$
$\underset{98.9\%}{{ }^{12} C}\,\, \underset{1.08\%}{{ }^{13} C}\,\, \underset{2\times 10^{-10}}{{ }^{14} C}$