Q. Correct increasing order of first ionisation potential is
A) $Na < Mg > Al < Si$
B) $Na < Mg < Al < Si$
C) $Na > Mg > Al > Si$
D) $Na < Mg < Al > Si$
Explanation
(a)
The ionisation energy increases when we move from left to right in a period. But this increase is not regular. The members of second group have greater ionisation potential as compared to third group due to stable configuration.
Ionisation potential has following order
$Na < Mg > Al < Si$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.