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Why I1 of Al is less than that of Mg?...

Why `I_1` of Al is less than that of Mg? 

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Reason 1 : Al has `p^1` configuration which is unpaired, bu Mg has more stable `s^2` configuration
Reason 2: Penetration ability of s-subshell of Mg is more than that of p -subshell of Al .
Reason 3 : Screening effect in Al is more than in Mg
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