atom 4d4d atomic orbitals. There are five 4d orbitals. These are labelled 4dxy, 4dxz, 4dyz, 4dx 24d atomic orbitals. There are five 4d orbitals. These are labelled 4d xy, 4d xz, 4d yz, 4d x 2-y 2 and 4d z 2. The 4d z 2 name is an abbreviation for 3d (3z 2 –r