As a first approximation, we can consider that in the A(C,E,M) units of Fig. : i) each covalent bond contains two electrons; ii) each LEP contains two electrons; and iii) each multicenter bond is characterized by sharing two electrons between every two atoms (ERMB) or only one electron between every two atoms (EDMB). This means that, in general, the geometric A(C,E,M) units of Fig. for EDMBs seem to satisfy the octet rule. This is not so clear for ERMBs , despite Grabowski has reasoned that the formation of the hypercoordinated units in molecules with ERMBs is connected with the mechanism of the σ-hole model to preserve the doublet rule of group-1 and -2 elements and the octet rule in main-group elements . Since this work is devoted to MMBs, which we have proposed to be equivalent to EDMBs, the violation or not of the octet rule in hypercoordinated units with ERMBs is not going to be further discussed in this paper.