Q. Which of the following has largest ionic radius?
A) $Cs^{+}$
B) $Li^{+}$
C) $Na^{+}$
D) $K^{+}$
Explanation
(a)
Atomic and ionic radii increase from top to bottom in a group due to the inclusion of another shell at every step. Hence, $Cs^{+}$ ion will be the largest among given IA group ions $(Na^{+},Li^{+}and\ K^{+})$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.