Q. In which of the following systems will the radius of the first orbit $(n = 1)$ be minimum
A) Single ionized helium
B) Deuterium atom
C) Hydrogen atom
D) Doubly ionized lithium
Explanation
(d) $r \propto \frac{1}{Z}$, for double ionized lithium $Z( = 3)$ will be maximum. So $r$ will be minimum
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.