Published by:
CGP EDU Academic Team
Published on: August 11, 2026
For the second period elements the correct increasing order of first ionisation enthalpy is
A
Li 
B
Li 
B 
Be 
C 
O 
N 
F 
B Be C O N F C
Li 
B 
Be 
C 
N 
O 
F 
B Be C N O F D
Li 
Text Solution
Verified by ExpertsThe correct answer is:
B
When we move from left to right in a period ionisation energy increases. 'Be' and ' N '
comparatively have more stable valence subshell than ' B ' and ' O ' respectively.
Thus, the correct order of first ionisation enthalpy is 
.
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