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Formula from Chapter 8: definition bond order
\(\mathrm{order}_{\mathrm{bond}} = \dfrac{⋕e_{\mathrm{bonding}} - ⋕e_{\mathrm{antibonding}}}{2}\)
\(⋕e_{\mathrm{\ce{O2},bonding}}\)
\(= 6\)
\(⋕e_{\mathrm{\ce{O2},antibonding}}\)
\(= 2\)
\(\mathrm{order}_{\mathrm{bond\ \ce{O2}}}\)
\(= \dfrac{⋕e_{\mathrm{\ce{O2},bonding}} - ⋕e_{\mathrm{\ce{O2},antibonding}}}{2}\)
\(\ \ \ =\dfrac{6 - 2}{2}\)
\(\ \ \ =\dfrac{4}{2}\)
\(\ \ \ =2\)