Q. Which of the following elements will have the lowest first ionisation energy?
A) Li
B) Mg
C) Ca
D) Rb
Explanation
(d)
IE decreases in a group and increases in a period. Thus, Rb has the lowest IE
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.