JEE MAIN - Chemistry (2021 - 27th July Evening Shift - No. 3)
The correct order of first ionisation enthalpy is :
Mg < S < Al < P
Mg < Al < S < P
Al < Mg < S < P
Mg < Al < P < S
Explanation
$$\matrix{
{Mg} & {Al} & P & {S \to IE} \cr
} $$ order $$\Rightarrow$$ Al < Mg < S < P
Valence [Ne] : $$\matrix{ {\mathop {3{s^2}}\limits^{Mg} } & {\mathop {3{s^2}3{P^1}}\limits^{Al} } & {\mathop {3{s^2}3{P^3}}\limits^P } & {\mathop {3{s^2}3{P^4}}\limits^S } \cr } $$
Valence [Ne] : $$\matrix{ {\mathop {3{s^2}}\limits^{Mg} } & {\mathop {3{s^2}3{P^1}}\limits^{Al} } & {\mathop {3{s^2}3{P^3}}\limits^P } & {\mathop {3{s^2}3{P^4}}\limits^S } \cr } $$
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