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Valence Shell Electron Pair Repulsion
Sulfur tetrafluoride has 5 regions of electron density around the central sulfur atom (4 bonds and one lone pair). These are arranged in a trigonal bipyramidal shape with 102° F-S-F bond angles between the equatorial fluorine atoms and 173° between the axial fluorine atoms.
The lone pair takes an equatorial position because it demands more space than the bonds. The result is a disphenoidal or ‘see-saw’ shaped molecule.
SF4 has a disphenoidal geometry in which one of the equatorial vertices of a trigonal bipyramid is occupied by a lone pair.
Related structures H2O | NH3 | CH4 | PF5 |SF4 |ClF3 | SF6 | XeF4
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