Interestingly, the small energy difference between the two configurations for AF6E molecules with ERMBs is similar to that we find between the two polymorphs of Po at 0 K, which explains that β-Po tends to α-Po above 2 GPa. Therefore, we can speculate that, similarly to the case of molecules with ERMBs , the cubic and rhombohedral configurations of Po likely occur because of the fine balance of the two above mentioned energy terms that depend on temperature and pressure. Moreover, it has been suggested that the electrons not involved in bonding in AF6E molecules with ERMBs and being part of the LEP could behave as a mixture of valence-core electrons, so that on average they contribute with only two valence electrons . Therefore, it can also be speculated that the three extra electrons, which are not directly involved in the three EDMBs of chalcogens, likely behave in a similar way, so that on average they contribute with only two valence electrons, that summed to the other six p-type electrons of the three EDMBs make the central atom to satisfy the octet rule. The mixture of valence-core electrons for s-type electrons can be justified in the Ah and Ai phases of group-16 elements because of the large energy difference between s and p states in chalcogens .