In terms of the slopes, all individual components also follow the general trend observed for the total scaling relations in that the slope becomes smaller with decreasing valency of the adsorbate (i.e. from CH to CH 4 ). But the slopes from the energy component scaling relations differ more substantially from the suggested theoretical values -0.75 (CH), 0.50 (CH 2 ), and 0.25 (CH 3 ) -than those observed in Figure for the total adsorption energies. Here in Figure , the slopes of charge transfer energies (0.67/0.47/0.39) and polarization energies (0.59/0.44/0.29) deviate less substantially from above theoretical values than the slopes of electrostatic (0.60/0.53/0.41) and van der Waals (0.56/0.43/0.35) energies, suggesting the potentially more substantial roles of POL and CT in leading to the slopes of the total adsorption energies.