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The first ionization potential of Aluminium is smaller than that of magnesium because

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Atomic size of Al > Atomic size of Mg

Al has one electron in p- orbitals

Atomic size of Al < atomic size of Mg

None of these

answer is C.

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Detailed Solution

$A l (3 s^{2} p^{1})$ and $M g (3 s^{2})$ . Lower energy is required to remove $3 p^{1}$ electron than $3 s^{1}$ electron (penetrating effect is s > p > d > f). secondly Mg has stable electronic configuration than Al

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