JEE Main Chemistry question

The first I.P. of Al is smaller than that of Mg because:

(A)Atomic size of Al Mg
(B)Al has one electron in a -orbitalCorrect
(C)Atomic size of Al Mg
(D)Not known

Answer: (B)

Solution

Magnesium's valence configuration is a stable, fully filled subshell, which resists electron removal, whereas aluminium's extra electron sits in a higher-energy, more shielded orbital

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Question ID VK-138548