To close this paper, we want to make a final observation on the hypercoordinated multicenter units shown in Fig. that we have previously cited in a cursory way regarding the different geometrical units that have been experimentally observed upon formation of both ERMBs and EDMBs in electron-rich elements, such as those of groups 15 and 16 . Note that the geometries in Fig. (in most cases related to the presence of LEPs) are different to those found in EDMBs of electron-deficient elements, such as group 13 and hydrogen, which have no LEP. It has been many times discussed in the literature that hypervalent molecules of main-group elements do not obey the 8 -N rule for atomic coordination, where N is the total number of valence s and p electrons . In other words, hypervalent molecules show a higher coordination (hypercoordination) than initially expected if all bonds were considered single covalent 2c-2e bonds. The violation of the 8 -N rule has been many times interpreted (e.g. Ref.