where E hyb alone cannot explain the row dependence (3d, 4d and 5d) of the scaling relations seen in Figure . Figure shows the scaling between E hyb for O* and C*. For almost the entire range, there is overlap between the three rows of transition metals (with the exception of the early transition metals) implying that this quantity does not cause the row dependence of scaling seen in the computed energies of Figure . To explain this row dependence, we study the other component of E chem , i.e. E ortho .