The angular momentum quantum number, also known as the azimuthal quantum number, uses the variable L and it equals the shape of the atom, so it gives us its shape. We're going to say the relationship between N and L is that when given the principal quantum number N, L equals 0 up to N - 1 because L has that N - 1 part to it.
The limitation is that the angular momentum quantum number L is always less than the principal quantum number N. So just remember that limitation when it comes to creating a relationship between your N quantum number and your L quantum number.