Published by:
CGP EDU Academic Team
Published on: August 14, 2026
The first ionization enthalpy 
values of the third period elements, 
, and Si are, respectively, 496, 737, and 
. Predict the first ionization enthalpy 
value of Al.
Text Solution
Verified by ExpertsThe correct answer is:
C
First electron to be removed from 
-orbital but, 
higher for Si
IE of Al should be smaller than Mg but higher than Na .
should be correct order ( 
in kJ 
)
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