Predict hybridisation and shape of `SF_(4)` molecule.

Explanation

electronic configuration of sulphur is `[Ne]3s^(2)3p^(4)3d^(0)` electronic configuration of excited state of sulphur is `[Ne]3s^(2)3p^(3)3d^(1)`
`SF_(4)` is formed when four half-filled `sp^(3)d` hybrid orbitals of sulphur atom overlap with half-filled 'p' orbitals of fluorine atoms. Hence, there exist four bond pairs and one lone pair in `SF_(4)` molecule. According to the VSEPR theory expected structure of `SF_(4)` is trigonal bipyramidal but as the lone plane and other two bond pairs present above and below the plane and the structure of `SF_(4)` is 'seesaw' structure. This deviation is due to the lone pair of electrons.