Relations between Chemical Bonds The Heterodesmic Lattices

5 Relations between Chemical Bonds The Heterodesmic Lattices 

The four types of bonds represent two classes of interactions between the particles of a lattice electrostatic interaction of Coulombian type and exchange interaction, the last one having a quantum nature. 

Quantum theory allows the explication also for ionic bond, though the above division is useful because limits the domain where classical physical representations can be used for the study of crystalline structures. Moreover, there is demonstrated that Coulombian interactions and of exchange interactions always coexist in a sort of bond, or more exactly, there are no structure completely absent of exchange interactions. 

On the other side, the physical meaning of van der Waals bond (residual) indicates the fact that also in this kind of interaction should be present almost one of its components in any system of particle. 

Obviously, when coexist more kinds of interactions of very different intensities in the same direction, those of low intensity (e.g., the residual one) may be neglected. Aiming to characterize the way of distribution of electric charges between two particles, i.e., for the interaction modeling, two paradigms are used the delocalization of the valence electrons (or the electrons collectivization) and the bonds delocahzation. 

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