Q. The correct order in which the first ionisation potential increases is
A) Na, K, Be
B) K, Na, Be
C) K, Be, Na
D) Be, Na, k
Explanation
(b)
The first ionisation potential generally increases in a period from left to right and decreases in a group from up to down. Thus, the correct order of first ionisation potential is
$K < Na < Be$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.