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  4. Oxygen molecule is paramagnetic in nature. What is the paramagnetic content in terms of magnetic moment in O-2?

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Q. Oxygen molecule is paramagnetic in nature. What is the paramagnetic content in terms of magnetic moment in $O^{-}_{2}$?

Chemical Bonding and Molecular Structure

Solution:

$O_{2}^{-} : \left(\sigma 1s^{2}\right)\left(\sigma^* 1s^{2}\right)\left(\sigma 2s^{2}\right)\left(\sigma^* 2s^{2}\right) \left(\sigma 2P_{z}^{2}\right)$
$\left(\pi 2p_{x}^{2} = \pi2p_{y}^{2}\right) \left(\pi^{ *} 2p_{x}^{2} = \pi^{ *} 2p_{y}^{1}\right)$
$O_{2}^{-} $ has $1$ unpaired electron.
$\mu=\sqrt{n\left(n+2\right)}B.M. $
$= \sqrt{1\left(1+2\right)} = \sqrt{3} $
$= 1.732 B.M.$