Animation of the structure of a molecule of water (H2O). This molecule has a bent geometry, with two hydrogen atoms (white) forming a shallow V with a central oxygen atom (red). This geometry is adopted as the hydrogen atoms repel each other, but the oxygen atom also contains two lone pairs of electrons (light blue), which also repel the hydrogens. See clip K004 3562 for the molecule without the lone pairs, and K004 3569 for the molecule showing the angle between the atoms.