Molecule	Electronic configuration	Bond order $= \frac{1}{2} [N_{b} - N_{a}]$
$C_{2}$	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2}$	$\frac{1}{2} [8 - 4] = 2$
$O_{2}$	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < σ 2 p_{z}^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < π^{} 2 p_{x}^{1} = π^{} 2 p_{y}^{1}$	$\frac{1}{2} [10 - 6] = 2$
${Be}_{2}$	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2}$	$\frac{1}{2} [4 - 4] = 0$
${Li}_{2}$	$σ 1 s^{2} < σ^{*} 1 s^{2} < σ 2 s^{2}$	$\frac{1}{2} [4 - 2] = 1$
${Ne}_{2}$	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < σ 2 p_{z}^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < π^{} 2 p_{x}^{2} = π^{} 2 p_{y}^{2} < σ^{*} 2 p_{z}^{2}$	$\frac{1}{2} [10 - 10] = 0$
$N_{2}$	$σ 1 s^{2} < σ^{} 1 s^{2} < σ 2 s^{2} < σ^{} 2 s^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2} < σ 2 p_{z}^{2}$	$\frac{1}{2} [10 - 4] = 3$
${He}_{2}$	$σ 1 s^{2} < σ^{*} 1 s^{2}$	$\frac{1}{2} [2 - 2] = 0$

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