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  4. How many orbitals are singly occupied in O2 molecule?

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Q. How many orbitals are singly occupied in $O_{2}$ molecule?

Chemical Bonding and Molecular Structure

Solution:

$M.O.$ configuration of $O_{2} :$
$\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) $
$\left(\pi^{ *} 2p_{x}^{1} = \pi^{ *} 2p_{y}^{1}\right)$