C2(12e−):σ1 s2,σ∗1 s2,σ2 s2,σ∗2 s2[π2px2=π2py2] B.O. =28−4=2O2(16e−):σ1 s2,σ∗1 s2,σ2 s2,σ∗2 s2,σ2pz2[π2px2=π2py2][π∗2px1=π∗2py1] B.O. =210−6=2 Be 2(8e−):σ1 s2,σ∗1 s2,σ2 s2,σ∗2 s2 B.O. =24−4=0Li2(6e−):σ1 s2,σ∗1 s2,σ2 s2 B.O. =24−2=1Ne2(20e−):σ1 s2,σ∗1 s2,σ2 s2,σ∗2 s2,σ2pz2[π2px2=π2py2][π∗2px2=π∗2py2]σ∗2pz2 B.O. =210−10=0 N2(14e−):σ1 s2,σ∗1 s2,σ2 s2,σ∗2 s2[π2px2=π2py2]σ2pz2 B.O. =210−4=6He2(4e−):σ1 s2,σ∗1 s2 B.O. =22−2=0