The results presented in Fig. illustrate one the central findings of the present work. The principal characteristics are detailed further in the Tables and. In Table we list the discussed factors of Mottness onset to show that they are mutually consistent. This agreement leads to the conclusion that the introduced entities ( )-( ) are not only relevant for the description of the Mott-Hubbard localization in condensed-matter (extended) systems, but also appear as a crucial incipient feature in molecular systems. We stress, this was possible only by introducing two-particle wave function as the proper characteristic of single bond which, after all, is composed of electron pairs. So far, our discussion was based on the wavefunction mechanics. In the remaining part we reformulate the analysis directly in the secondquantization language which will allow us to provide the physical interpretation of the bond in terms of particle densities. Namely, to amplify our multiparticle bond description we return to the particle language and display in Fig.