Energy level diagrams.

The energy of the MOs of diatomics are shown in the energy level diagrams wherein the energies of AOs are shown at the two ends and the energies of the MOs are shown in the middle. Fig 7.9 shows the energy level diagram for the first and second row diatomics.

                                Fig 7. 9 (b) The energy level diagrams of the second row diatomics O₂ and F_2.