# What is the VSEPR shape of SO_2?

The molecule is bent around the central sulfur, with an $\angle O - S - O$ $=$ <120""^@.
Resonance structures of ""^(-)O-S^(+)=O and ""^(-)O-S^(2+)-O^- are valid. In either case there are 3 regions of electron density around the central sulfur: a lone pair, and $2 \times S - O$ bonds, The electronic geometry should be based on a trigonal plane. But, because we describe molecular geometry on the basis of bonds not electron pairs, we describe the geometry of $S {O}_{2}$ as bent. The actual molecule has $\angle O - S - O$ $=$ 119""^@.