H2→ Diamagnetic σ1s2
He2+→Paramagnetic σ1s2,σ1s*1
Li2→Diamagnetic σ1s2,σ1s*2,σ2s2
Be2→Diamagnetic σ1s2,σ1s*2,σ2s2,σ2s*2
B2→Paramagnetic σ1s2,σ1s*2,σ2s2,σ2s*2,π2px1π2py1
C2→Diamagnetic σ1s2,σ1s*2,σ2s2,σ2s*2,π2px2π2py2
N2→ Diamagetic σ1s2,σ1s*2,σ2s2,σ2s*2,π2px2π2py2,σ2pz2
O2−→ Paramagnetic σ1s2,σ1s*2,σ2s2,σ2s*2,σ2pz2,π2px2,π2py2,π2px*2,π2py*1
F2→ Diamagnetic σ1s2,σ1s*2,σ2s2,σ2s*2,σ2pz2,π2px2,π2py2,π2px*2,π2py*2
The number of diamagnetic species is 6 i.e H2,Li2,Be2,C2,N2 and F2 are diamagnetic species