Q. The mass number of a nucleus is 216. The size of an atom without changing its chemical properties are called
A) $7.2 \times 10^{- 13}cm$
B) $7.2 \times 10^{- 11}cm$
C) $7.2 \times 10^{- 10}cm$
D) $3.6 \times 10^{- 11}cm$
Explanation
(a) $R = R_{0}A^{1/3} = 1.2 \times 10^{- 13} \times (216)^{1/3}$
$= 7.2 \times 10^{- 13}cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.