What is Transitional Elements

The structures of compounds of a metal atom with ligands were studied by sequentially changing the groups and subgroups of the periodic system of elements in which the metal atom is located. It is shown that all metals from the first to the eighth groups form chemical compounds of a higher dimension. The formation of molecules of higher dimension occurs due to the chemical bonds of the metal atom with ligands both due to the influence of electron pairs and due to the attraction of ions. Moreover, the apparent valence of the metal atom, as a rule, exceeds the value of the valence determined by the location of the metal in the periodic table of chemical elements.