For O2, as shown in Fig. , n=6. However, Fig. exhibits that the maximum A=4.2336 corresponds to n≥9. O2 has two spare O p 2 orbitals. Since the kinetic energies of all electrons are equal, apart from a σ bond, the molecular structure oscillates O p 4 ↔ O p 2 , by which an additional 5 operations are obtained. Therefore, n=11 for O2.