Which one of the following sets of quantum numbers is not possible for an electron in the ground state of an atom with atomic number 19 ?

 n=3,l=2,m= ±2. It corresponds to 3d orbital. 3d is absent in atomic no 19,The electronic configuration of the atom is 1s²2s²2p⁶3s²3p⁶4s¹

Aufbau principle:
In the ground state of the atoms, the orbitals are filled with electrons in order of increasing energy.