Published by:
CGP EDU Academic Team
Published on: August 14, 2026
In which of the following arrangements, the order is NOT according to the property indicated against it?
A
: Increasing metallic radius
B
I 
: Increasing electron gain enthalpy (with negative sign)
: Increasing electron gain enthalpy (with negative sign) C
B 
C 
N 
O : Increasing first ionisation enthalpy
C N O : Increasing first ionisation enthalpy
D
: Increasing ionic size
Text Solution
Verified by ExpertsThe correct answer is:
C
In a period, the value of ionisation potential increases from left to right with breaks where the atoms have somewhat stable configuration. In this case, 
has halffilled stable orbitals. Hence, it has highest ionisation energy. Thus, the correct order is :
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