Molecules	Number of electrons	Electronic configuration	Number of unpaired electrons
$O_{2}$	16	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < σ 2 p_{z}^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < π^{} 2 p_{x}^{1} = π^{} 2 p_{y}^{1}$	2
$O_{2}^{-}$	17	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < σ 2 p_{z}^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < π^{} 2 p_{x}^{2} = π^{} 2 p_{y}^{1}$	1
$NO$	15	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < σ 2 p_{z}^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < π^{} 2 p_{x}^{1} = π^{} 2 p_{y}^{0}$	1
${CN}^{-}$	14	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < σ 2 p_{z}^{2}$	0
$O_{2}^{2 -}$	18	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < σ 2 p_{z}^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < π^{} 2 p_{x}^{2} = π^{} 2 p_{y}^{2}$	0

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