In order to produce sp3d hybrid orbitals, s atomic orbital(s), p atomic orbital(s), and d atomic orbitals must be mixed/hybridized. after the hybridization, there is/are unhybridized p orbital(s) around the central atom.

1 s, 3 p and 1 d. The 3, and are half filled.

Explanation:

In the production of sd hybrid orbitals, 1 s, 3 p and 1 d orbitals of approximately the same energy intermix are used to create 5 identical/degenerate hybrid orbitals. These orbitals are arranged to form a trigonal bipyramidal symmetry. Three orbitals are arranged in a trigonal plane and the other two orbitals are arranged up/down the trigonal plane at right angles.

Using P as an example, its formation requires five unpaired electron, the phosphorus atom was excited and one electron from the 3s filled one of the vacant 3d orbitals. Thus intermixing the orbitals created the  sd hybrid orbitals with half-filled 3, and .

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