Which of the following species has four lone pairs of electrons

I

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O

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C l^{-}

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H e

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Solution

The correct option is C $C l^{-}$
Outer electronic configuration of $C l = 3 s^{2} 3 p_{x}^{2} 3 p_{y}^{2} 3 p_{z}^{1}$
Outer electronic configuration of $C l^{-} = 3 s^{2} 3 p_{x}^{2} 3 p_{y}^{2} 3 p_{z}^{2}$ i.e., 4 lone pair of electrons

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Which species has the maximum number of lone pair of electrons on the central atom?

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