Which one among the following contains the valence electrons in the ground state of the magnesium atom?

1 s

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2 s

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3 s

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3 p

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3 d

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Solution

The correct option is A $3 s$
3s orbital contains the valence electrons in the ground state of the magnesium Mg atom.
The ground state electronic configuration of Mg (Z=12) is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$ .

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