Which molecule/ion out of the following does not contain unpaired electrons?

The electronic configuration of the given molecules areN2+=13 electrons σ1s2,σ*1s2,σ2s2,σ*2s2,π2px2=π2py2,σ2pz1It has one unpaired electronO2=16 electrons σ1s2,σ*1s2,σ2s2,σ*2s2,σ2pz2π2px2≈π2py2,π*2px1≈π*2py1O2 has two unpaired electrons.O22-=18 electrons σls2,O*1 s2,σ2s2,σ*2s2,σ2pz2π2px2≈π2py2,π*2px2≈π*2py2Thus, O22- has no unpaired electrons.B2=10 electrons σls2,*σ2s2,σ2s2,σ*2s2,π2px1≈π2py1Thus, B2 has two unpaired electrons.