In ${\mathrm{SO}}_2$ two oxygen atoms are linked to the sulfur atom through double bonds. The two bonds are;

 ${\mathrm{SO}}_2$ is the anhydride of sulfurous acid. It is angular with bond angle $119°{30}^{\text{'}}$. It has one ${\mathrm{d}}_{\mathrm{\pi }}-{\mathrm{d}}_{\mathrm{\pi }}$ and one  ${\mathrm{p}}_{\mathrm{\pi }}-{\mathrm{p}}_{\mathrm{\pi }}$  bond. Its bond length is $1.43\mathrm{ }\mathrm{A}°$.