According to MOT, highest occupied molecular orbital (HOMO) in O2- is
σ2p*
π2p*
σ2p
π2p
O2-2-KK'σ2s2σ2s*2σ2pz2π2px2π2py2π2px*2π2py*2
O2--KK'σ2s2σ 2s*2σ2pz2π2py2π2py2π2px*2π2py*1
O2 -KK'σ2s2σ2s*2σ2pz2π2px2π2py2π2px*1π2py*1
O2+-KK'σ2s2σ2s*2σ2pz2π2px2π2py2π2px*1π2py*0
Bond order and magnetic moment :
μs=nn+2 B. M ; O2-2=10-82=1; Diamagnetic...μs=0 ; O2-=10-72=1.5; Paramagnetic..μs=1.732 B.M ; O2=10-62=2; Paramagnetic.......μs=2.82 B.M ; O2+=10-52=2.5; Paramagnetic.....μs=1.732B.M ;
O — O bond length in
O2-2>O2->O2>O2+