Q. The ionisation potential order for which set is correct?
A) Cs < Li < K
B) Cs < Li > B
C) Li > K > Cs
D) B > Li < K
Explanation
(c)
The ionisation potential decreases down the group (due to increases in size of atom) and increases in a period from left to right.
$\therefore$ Out of the given choices $Li > K > Cs$ is correct.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.