SATHEE: Chemical Bonding and Molecular Structure

Chemical Bonding and Molecular Structure - Result Question 118

####122. Among the following which one is not paramagnetic? [Atomic numbers : $B e = 4$ , $N e = 10, A s = 33, C l = 17]$

[1998]

(a) $C r^{-}$

(b) $B e^{+}$

(d) $A s^{+}$

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Solution:

(a) Paramagnetic character is based upon presence of unpaired electron

$\begin{aligned} C l^{-} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p_{x}^{2} 3 p_{y}^{2} 3 p_{z}^{2} \\ B e^{+} = 1 s^{2} 2 s^{1} \end{aligned}$

$\begin{matrix} N e^{2 +} = 1 s^{2} 2 s^{2} 2 p_{x}^{2} 2 p_{y}^{1} 2 p_{z}^{1} \\ A s^{+} = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} \\ 4 s^{2} 4 p_{x}^{1} 4 p_{y}^{1} 4 p_{z}^{1} \end{matrix}$

Hence only $C l^{-}$ do not have unpaired electrons.

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Chemical Bonding and Molecular Structure - Result Question 118

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