SO2 ,SO3和 H2 SO4这样的分子 ,由于其中 S原子的“超价”(supervalent)而被称为“超价分子”。对于它们的成键特性 ,除早期价键理论的共振论观点外 ,一般都采用简单分子轨道理论观点加以解释 ,认为在 SO2 和 SO3分子中 ,诸原子在同一平面上 ,S原子 sp2 杂化 ,与 O原子形成σ键 Molecules such as SO2, SO3 and H2 SO4 are referred to as “hypervalent molecules” due to the “supervalent” of the S atoms therein. For their bonding properties, except for the resonance theory of early valence bond theory, the theory of simple molecular orbital theory is generally used to explain that in atoms SO2 and SO3, sp2 hybridizes to S atoms on the same plane, Σ bond with O atom