The Four Quantum Numbers of an Atom

The poly exclusion principle says that no two electrons can share the same four quantum numbers. The first is the principal quantum number or N, the second is the angular momentum or as Muthl quantum number, which is L. And then there is the magnetic quantum number,  M sub L, which is M subscript S. Lastly, we have the spin quantum number or M sub S and this is either plus one half or minus one half.