For 10 points, name this model of chemistry, developed by Hans Bethe, which explains the electronic structure of d-block metals.
One type of energy important in this theory is directly proportional to the mean of the fourth power of a certain radius and inversely proportional to the fifth power of another radius, and a normalized version of it is found on the x-axis in a Tanabe-Sugano diagram; that energy is its namesake stabilization energy. This theory, which unlike a similar theory does not attempt to describe bonding, states that nonbonding electrons on negative ligands cause the d-orbitals in a cation to split into e-sub-g and t-sub-2g orbitals, which explains the colors exhibited by coordination complexes. It is combined with molecular orbital theory to form ligand field theory. For 10 points, name this model of chemistry, developed by Hans Bethe, which explains the electronic structure of d-block metals.
One type of energy important in this theory is directly proportional to the mean of the fourth power of a certain radius and inversely proportional to the fifth power of another radius, and a normalized version of it is found on the x-axis in a Tanabe-Sugano diagram; that energy is its namesake stabilization energy.
crystal field theory [or CFT; prompt on ligand field theory or LFT until "bonding"]