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CGP EDU Academic Team
Published on: August 13, 2026
The first ionization energy of Mg is greater than that of Al because:
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Verified by ExpertsThe correct answer is:
C
Penetration of p -subshell electron is less than s subshell electrons. In case of Mg, the first electron is to be removed from completely filled 
valence shell configuration as compared to partially filled 
of Al. These two factors collectively accounts for the higher ionisation energy of Mg than that of Al.
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