Animation of the structure of a molecule of sulfur dioxide (SO2). This molecule has a bent geometry, with two oxygen atoms (red) forming a shallow V with a central sulfur atom (yellow). This geometry is adopted as the oxygen atoms repel each other, but the sulfur atom also contains a lone pair of electrons (light blue), which repels the oxygens slightly more than they do each other. See clip K004 3552 for the molecule without the lone pair, and K004 3565 for the molecule showing the angle between the atoms.