Question: what are the four quantum numbers for gallium?
Answer: The highest energy electron in Ga is the single 4p electron, which can either be in the 4px , 4py , or 4pz orbital, and it can either be spin up or spin down. So, there are 2×3=6 possible sets of quantum numbers. For the 4p orbital: n=1,2,...,N⇒4 for the principal quantum number.