What is the electronic configuration of the ground state of the magnesium cation, $M g^{2 +}$ ?

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}

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1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

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1 s^{2} 2 s^{2} 2 p^{6}

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1 s^{2} 2 s^{2} 2 p^{4} 3 s^{2}

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Solution

The correct option is B $1 s^{2} 2 s^{2} 2 p^{6}$
$M g^{2 +}$ has $10$ electrons. Hence the electronic configuration is $1 s^{2} 2 s^{2} 2 p^{6}$ .
Hence, option C is the right answer.

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