Question: what are the four quantum numbers of 19th electron of copper?
Answer: Since according to this rule the electrons are filled in the 1s, 2s, 2p, 3s, 3p, 4s, 3d, … order, the 19th electron is occupying 4s orbital. The corresponding quantum number is n=4, l=0, and may be +1/2, -1/2 or both at same time (see Quantum superposition - Wikipedia).