Covalent bonds feature ES ≈ 2 and have a bond order of 1. In contrast, MMBs in PCMs and group-15 and -16 elements are characterized by smaller values of ES (≈ 1) and by longer bonds leading to a bond order of 0.5. On the other hand, molecules with EDMBs, such as diborane (B2H6) , and with ERMBs, such as I3 ꟷ , are also considered to have a bond order of 0.5 , since bonds in ERMBs and EDMBs are also longer than covalent bonds. Although ERMBs and EDMBs have a similar bond order, recent results of Wuttig and coworkers have shown that molecules with ERMBs, such as ClF3, XeF2, and SF4, possess ES values higher than 1.5 ; i.e. similar to covalent bonds. Additionally, the absolute values of ∇ 2 ρ in molecules with ERMBs used to be positive and much larger than those found in the MMBs in this and previous works . However, the negative value of the ICOBI(3c) in PCMs and in group-15 and -16 elements has been previously interpreted as if the MMBs were ERMBs and not EDMBs since negative values of ICOBI(3c), although much larger, have been reported for molecules with ERMBs, such as XeF2 .