During change of O2 to O2- ion, the electron adds on which one of the following orbitals

O2⟶+1e−O2−Molecular orbital configuration of O2 σ1s2σ∗1s2σ2s2σ∗2s2σ2pz2π2px2=π2py2π∗2px1=π∗2py1therefore incoming  e− would enter into  π∗2pxmolecular orbital