In which species can we describe the central atom as having ${\mathrm{sp}}^2$ hybridization?

The type of hybridization that occurs in sulphur dioxide is ${\mathrm{sp}}^2$. This central atom becomes ${\mathrm{SO}}_2$ when it bonds with two oxygen atoms, resulting in a structure with the formula O=S=O. Sulfur and the two oxygen atoms have one sigma bond and one pi bond created between them. One single pair can also fit inside the atom.