Bond order (B.O) \(=\frac{1}{2} \times\) [Number of an electron in antibonding molecular orbitals] - [Number of electrons in bonding molecular orbitals]
B. \(O\) for \(O_{2}{ }^{2-}=\frac{1}{2} \times[10-8]=\frac{1}{2} \times 2\)
B.O for \(\mathrm{O}_{2}{ }^{2-}=1\)
