In the compound SF6, the central atom is sulfur S . To determine the hybridization of the central atom, we need to consider the number of electron domains around it.Sulfur has 6 valence electrons, and it forms 6 sigma bonds with the 6 fluorine F atoms. Therefore, there are 6 electron domains around the sulfur atom.According to the VSEPR Valence Shell Electron Pair Repulsion theory, the electron domains will arrange themselves to minimize repulsion. In this case, the arrangement that minimizes repulsion is an octahedral geometry.To achieve an octahedral geometry, the sulfur atom needs to use six orbitals for bonding. It has one 3s, three 3p, and five 3d orbitals available. To form six hybrid orbitals, sulfur will use one 3s, three 3p, and two 3d orbitals. This results in spd hybridization.So, the hybridization of the central atom sulfur in the compound SF6 is spd.