SF4 contains four bonded and one nonbonded electron domains, giving a trigonal bipyramidal e- domain geometry and a see saw molecular geometry (AX4E). The bond angles are compressed relative to those in a perfect trigonal bipyramid due to the lone pair spreading out more in space than bonded pairs. The lone pair is in an equatorial rather than axial position because that arrangment minimizes electrostatic repulsion with the bonded electron domains.
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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Model type: Spacefill ball and stick stick only
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