Which of the following species is not paramagnetic in nature? [Atomic number: Be = 4, Ne = 10, As = 33, Cl = 17]

N e^{2 +}

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B e^{+}

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C l^{-}

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A s^{+}

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Solution

The correct option is C $C l^{-}$
$N e^{2 +} (8) \Rightarrow 1 s^{2} 2 s^{2} 2 p_{x}^{2} 2 p_{y}^{1} 2 p_{z}^{1}$
$B e^{+} (3) \Rightarrow 1 s^{2} 2 s^{1}$
$C l^{-} (18) \Rightarrow 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}$
$A s^{+} (32) \Rightarrow 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p_{x}^{1} 4 p_{y}^{1}$
$C l^{-}$ is not paramagnetic as it does not have an unpaired electron.

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K^{+}, C l^{-}, S^{2 -}, C a^{2 +}

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S, P, S e

C l

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