Structure of water, H2O. H2O contains 2 bonded and two nonbonded electron domains, giving a tetrahedral e- domain geometry and a bentmolecular geometry. (AX2E2). The H-O-H bond angle (104 degrees) is less than in a perfect tetrahedron because the lone pair electrons spread out more in space than bonded electron pairs, compressing the bond angle. A cartoon model of the electron density of the lone pairs of electrons, represented by translucent purple spheroids, can be toggled on and off. Note that the shape of the spheroid does not represent the actual electron density of the lone pair, but allows you to visualize how the presence of the lone pairs dictates the molecular geometry.
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