First ionisation potential of magnesium is greater than that of aluminium because

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Aluminium atom is very large when compared to Magnesium atom

Aluminium has a stable electronic configuration

Magnesium has a stable electronic configuration

The electron affinity of Magnesium is positive (energy is absorbed)

answer is C.

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Detailed Solution

Mg(Z=12)...[Ne]3s2Al(Z=13)...[Ne]3s23p1"Mg" has completely filled 3s orbital (symmetrical configuration) leading to stability

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