Sulfur dioxide (SO2)

Bent sulfur oxide; compare electron counting with ozone and discuss d-orbital participation controversies at qualitative level. Teaching note: figures illustrate qualitative electronic structure; quantitative benchmarking should use larger bases, dispersion, and experimental structures.

Geometry
Bent
Polarity
Polar
Bond angle
119°
Hybridisation
sp2-like on S
VSEPR
AX2E
Bonds
S=O σ+π interactions
Molecular orbitals
18 valence MOs; RHF captures σ frame but π correlation matters quantitatively.
SMILES
O=S=O

Electron density: spin-paired GPAW (PBE) on an isolated gas-phase geometry; molecular orbitals: restricted mean-field RHF with sto-3g in PySCF unless noted.

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