The octahedral geometry of a molecule is when a central atom is bound with six atoms or six ligands.
In octahedral complexes molecule has to make the bond with six atoms so they have one s orbital, three p orbitals, and two d orbitals involve in bond formation.
Thus the hybridization of octahedral is .
Example-Sulphur Hexafluoridehas the octahedral geometry where one Sulphur atom makes six bonds with Fluorine.
Sulphur uses its one s orbital, three p orbitals, and two d orbitals. Thus has a hybridization .