Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Correct order of 
ionization enthalpy among elements Be, 
is
A
B 
Be 
C 
O 
N
Be C O N
B
B 
Be 
C 
N 
O
Be C N O
C
B 
C 
N 
O
D
B 
C 
O 
N
Text Solution
Verified by ExpertsThe correct answer is:
A
I.E increases while moving from left to right in period due to decrease in atomic size and increase in 
I.E. of B is less than Be because Be has fully filled stable 
valence configuration, hence it requires more energy to remove electron from it. Now, ' N ' has more I.E than ' 
' due to half filled valence 
configuration, therefore, the correct order is 
.
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