Crystal field theory is a model that describes the electronic structure of transition material compounds, most of that can be considered coordination complexes. CFT successfully makes up about some magnetic properties, shades, hydration enthalpies, and spinel set ups of transition metal complexes, but it does not attempt to illustrate bonding. CFT was developed by physicists Hans Bethe and John Hasbrouck van VlecK in the 1930s. CFT was eventually coupled with molecular orbital theory to create the more natural and intricate ligand field theory (LFT), which gives insight into the process of chemical substance bonding in transition material complexes. In the ionic CFT, the assumption is that the ions are simple point charges. When put on alkali metallic ions filled with a symmetric sphere of demand, computations of energies are usually quite successful.