The Significance of Ionic Bonding in Sulfur Dioxide: Bond Orders from X-ray Diffraction Data

摘要

Lewis diagrams and the octet rule are central concepts in chemistry. Hypervalent molecules break the octet rule because they contain atoms with more than four electron pairs in their valence shell. To describe them with the Lewis model requires hybridization schemes involving d orbitals (sp~3d or sp~3d~2 hybrids).The problem is that the formation of these hybrid orbitals requires large promotion energies. Therefore, the significance of ionic resonance diagrams, which obviate the need for hypervalency, has long been discussed.