Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is
A
and 
B
and 
C
and 
D
Be and 
Text Solution
Verified by ExpertsThe correct answer is:
B
: 
and 
have higher values than expected, this is due to stable configurations of these elements. 
and 
have fully-filled orbitals, in nitrogen 
-orbitals are half-filled.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
In the following, the element with the highest ionisation energy is
In the periodic table metals usually used as catalysts belong to
An element with atomic number 21 is a
The correct order in which the first ionization potential increases is
The correct order of ionisation energy of , is
The oxide of an element whose electronic configuration is is