What is the electronic configuration of neutral $M g$ and $C l$ ?

M g; [N e] 3 s^{2}

;

C l : [N e] 3 s^{2} 3 p^{5}

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M g; [N e] 3 s^{1}

;

C l : [N e] 3 s^{2} 3 p^{5}

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M g; [N e] 3 s^{2}

;

C l : [N e] 3 s^{2} 3 p^{4}

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M g; [N e] 3 s^{2}

;

C l : [N e] 3 s^{2} 3 p^{6}

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Solution

The correct option is A $M g; [N e] 3 s^{2}$ ; $C l : [N e] 3 s^{2} 3 p^{5}$
The electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
For example: $[N e] = 1 s^{2} 2 s^{3} 2 p^{6}$
Therefore, the electronic configuration of $M g$ = $[N e] 3 s^{2}$
The electronic configuration of $C l$ = $[N e] 3 s^{2} 3 p^{5}$

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