play a role, but are not as significant as Pauling had believed.

A widely accepted description involving p? - d? bonding was initially proposed by Durward William John Cruickshank. In this model, fully occupied p orbitals on oxygen overlap with empty sulfur d orbitals (principally the d_z² and d_x²-y²). However, in this description, despite there being some ? character to the S-O bonds, the bond has significant ionic