# Are orbitals always filled in from closest to nucleus to farthest away?

On a review sheet for a quiz I have tomorrow, I have a question like this: "In which orbital, 4f or 6s, would an electron have a greater likelihood of being near the nucleus". I figured that the 6s would be closest, since it is filled in first when using the Aufbau principle. However, does that necessarily imply that it is closer to the nucleus? Or would 4f be closer, since it's principle quantum # is smaller?

Radial distribution of selected orbitals in $\ce{Sm^{3+}}$, http://pubs.rsc.org/en/content/articlehtml/2004/dt/b407173e