Which of the following contains one pair of electrons in the ground-state electron configuration of the lithium 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 B $1 s$
The ground-state electron configuration of the lithium atom is $1 s^{2} 2 s^{1}$ . The atomic number of Li is 3.

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