Diamagnetic specics have no unpaired electrons whereas paramagnetic species has one or more unpaired electrons. For electronic configuration of O2+,O2 and O22, consult Q.2. O2 and O2+ have 2 and 1 unpaired electron respectively, while O22− has no unpaired electron NO→KKσ2s2σ*2s2σ2pz2π2px2=π2py2 π*2px1=π*2py0 Thus no has one unpaired electron