Molecule	Electronic configuration	Number of unpaired electrons
$H_{2}$	$σ 1 s^{2}$ (diamagnetic)	$\frac{1}{2} \times (2 - 0) = 1$
${He}_{2}^{+}$	$σ 1 s^{2}, σ^{*} 1 s^{1}$ (paramagnetic)	$\frac{1}{2} \times (2 - 1) = 0.5$
$O_{2}^{+}$	$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, π^{*} 2 p_{x}^{1}$ (paramagnetic)	$\frac{1}{2} \times (10 - 5) = 2.5$
$N_{2}^{2 -}$	$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, σ 2 p_{z}^{2}, π^{*} 2 p_{x}^{2}$ (diamagnetic)	$\frac{1}{2} \times (10 - 6) = 2$
$O_{2}^{2 -}$	$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, π^{} 2 p_{x}^{2}, σ^{} 2 p_{y}^{2}$ (diamagnetic)	$\frac{1}{2} \times (10 - 8) = 1$
$F_{2}$	$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, π^{} 2 p_{x}^{2}, π^{} 2 p_{y}^{2}$ (diamagnetic)	$\frac{1}{2} \times (10 - 8) = 1$
${Ne}_{2}^{+}$	$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}, σ 2 p_{z}^{2}, π 2 p_{x}^{2}, π 2 p_{y}^{2}, π^{} 2 p_{x}^{2}, π^{} 2 p_{y}^{2}, σ^{*} 2 p_{z}^{1}$ (paramagnetic)	$\frac{1}{2} \times (10 - 9) = 0.5$
$B_{2}$	$σ 1 s^{2}, σ^{} 1 s^{2}, σ 2 s^{2}, σ^{} 2 s^{2}, π 2 p_{x}^{1}, π 2 p_{y}^{1}$ (paramagnetic)	$\frac{1}{2} \times (6 - 4) = 1$

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