The valence electronic configuration of magnesium is:

4 s^{1}

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4 s^{2}

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3 s^{1}

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3 s^{2}

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Solution

The correct option is D $3 s^{2}$
The atomic number of Mg is 12 and the electronic configuration is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$ . Thus, the valence configuration is $3 s^{2}$ .

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