The bond order is the number of chemical bonds between a pair of atoms. For $\mathrm{Li}_{2}$, $\mathrm{B}_{2}$, $\mathrm{C}_{2}$, $\mathrm{N}_{2}$, and $\mathrm{O}_{2}$, the bond orders are 1, 1, 2, 3, and 2 respectively. This is because Lithium and Boron each
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