Three kinds of Electrons in Metal Crystals. Band theory of a Metal from the side of its Crystal Lattice

The literature generally describes a metallic bond as the one formed by means of mutual bonds between atoms’ exterior electrons and not possessing the directional properties. However, attempts have been made to explain directional metallic bonds, as a specific crystal metallic lattice. This paper demonstrates that the metallic bond in the densest packings (volume-centered and face- centered) between the centrally elected atom and its neighbours in general is, probably, effected by 9 (nine) directional bonds, as opposed to the number of neighbours which equals 12 (twelve) (coordination number). Probably, 3 (three) “foreign” atoms are present in the coordination number 12 stereometrically, and not for the reason of bond. This problem is to be solved experimentally.