Figure , Orbital symmetry of some molecules As shown in Fig. , H2O and H2S are asymmetric molecules in terms of the geometric symmetry of mass. However, H2S acts as a symmetric molecule. A=3.6898 corresponds to n ≥ 8. It is likely ascribed to the large 3sp 3 hybridized orbital of S, relative to the small 1s orbital of H. Two H-S bonds do not destroy the tetrahedral symmetry of the sp 3 hybridized orbital (see CH4, n=8), though it inevitably deforms. Hence, n=8 is possible.