Case in which we deal a metal transition element in the center and four ligands spread geometrically in its contour. If the ligand orbitals (“B”) have enough energy, then combine with “A” inner orbitals (5d)… Remember that in T.O.M. nº atomic orbitals= nº molecular orbitals…
T.O.M. “ab4” WHERE “A” IS A TRANSITION ELEMENT
