Structure of sulfur dioxide, SO2. SO2 contains 2 bonded and one nonbonded electron domains, giving a trigonal planar e- domain geometry and a bent molecular geometry (AX2E). The bond angle is smaller (119 rather than 120 degrees) than in a perfect trigonal plane due to lone pairs spreading out more in space than bonded pairs. A cartoon model of the electron density of the lone pair of electrons, represented by a translucent green spheroid, 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 that lone pair dictates the molecular geometry.


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