Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The first ionization potential of Al is smaller than that of Mg because
A
The atomic size of 
B
The atomic size of 
C
Al has one unpaired electron in 
-orbital
-orbital D
Mg has incompletely filled 
-orbital
-orbital
Text Solution
Verified by ExpertsThe correct answer is:
C
Al 
For first 
, the electron is with drawn from partially filled p-orbital having less penetration power than s and in Mg the electron is withdrawn from fully filled 
-orbitals having high perentration power.
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