Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The correct order of 
and F in terms of second ionisation potential is
A
B
C
C 
F 
N 
O
F N O
D
F 
Text Solution
Verified by ExpertsThe correct answer is:
A
Second ionization potential ( 
) is the energy to remove the second electron.
After removing the first electron: 
has 
has 
has 
(half-filled, stable), 
has 
.
has lowest 
as 
electrons are least tightly bound with lowest nuclear charge.
N has slightly higher 
than C due to increased nuclear charge.
F has highest 
due to highest effective nuclear charge.
with half-filled 2 p is relatively stable, making 
of O intermediate.
Order: 
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