In SF4, the central atom is sulfur S . To determine the hybridization of the central atom, we need to first find its electron domain geometry. 1. Count the valence electrons of the central atom: Sulfur has 6 valence electrons.2. Count the number of atoms bonded to the central atom: There are 4 fluorine F atoms bonded to the sulfur.3. Count the number of lone pairs on the central atom: Sulfur has 6 - 4x2 = 6 - 8 = -2 electrons left for lone pairs, but since it can expand its octet, it will use one of its d orbitals to accommodate the extra electrons. So, it will have 1 lone pair.Now, we have 4 atoms bonded to the central atom and 1 lone pair, which gives us a total of 5 electron domains. According to the VSEPR theory, 5 electron domains result in a trigonal bipyramidal electron domain geometry. In a trigonal bipyramidal geometry, the hybridization of the central atom is sp3d. Therefore, the hybridization of the central atom sulfur in SF4 is sp3d.