An orbital that could never exist according to the quantum description of the atom is

For the 3 principal orbitals, f suborbital has not been possible. Thus the orbital that could never exist according to the quantum description of the atom is 3f. Thus the correct option is d.

Quantum mechanics helps in the determination of the electron address. The electron address has been given by the 4 quantum numbers namely,

The principal quantum number gives the information to the orbital, and the azimuthal quantum number gives the information of the subshell.

The orbitals have been formed by the mixing of the bonding and anti-bonding orbital. The mixing of the 3 orbital has resulted in the 3 suborbital namely s, p, and d.

Thus for the 3 principal orbitals, f suborbital has not been possible. Thus the orbital that could never exist according to the quantum description of the atom is 3f. Thus the correct option is d.

For more information about the quantum description of atom, refer to the link:

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d. 3f

Explanation:

An orbital in chemistry is defined as the wave function that defines the position of electrons in an atom.

There are four types of orbitals that include s, p, d, and f. On the basis of the quantum description, 3f orbital does not exist because in the third energy level only three sublevels are present that are s, p, and d that can hold a  maximum of 18 electrons.

Hence, the correct answer is "d.3f".

you need to have a picture of the atom that way we can answer it