Final answer:
An sp3d hybridized atom has a central atom with five sp3d hybrid orbitals, resulting in trigonal bipyramidal geometry with a combination of s, p, and d orbitals.
Step-by-step explanation:
An atom that is sp3d hybridized must have a central atom that is bonded to five other atoms or groups through sigma bonds and may also have lone pairs. In this hybridization state, the central atom combines one s orbital, three p orbitals, and one d orbital to form five sp3d hybrid orbitals. This results in a trigonal bipyramidal molecular geometry, where three of the orbitals lie in one plane, forming a triangle, and the other two occupy positions above and below this plane. This often occurs in molecules with five regions of electron density, such as phosphorus pentachloride (PCl5), where the central phosphorus atom is sp3d hybridized.