Molecular orbital configuation of O22- (peroxide ion)
N0 of electrons in bonding orbitals = 12 + 2 = 14
σ 2s)2, (σ * 2s)2 (σ 2px)2 (π 2py)2 (π 2pz)2 (π * 2py)2 (π * 2pz)2
Bond order = \(\frac{8 - 6}{2}\) = +1
Bond order of +1 indicates that O22- is less stable than other species of O2 discussed above. It is diamagnetic as it has no unpaired electron.
