Which part of the periodic table indicates the number of energy levels in the electron cloud?

Which electron is, on average, farther from the nucleus: an electron in a 3p orbital or an electron in a 4p orbital?

(d) For the hydrogen atom, list the following orbitals in order of increasing energy (that is, most stable ones first): 4f, 6s, 3d, 1s, 2p.

(c) What can you say about the average distance from the nucleus of an electron in a 2s orbital as compared with a 3s orbital?

The fifth row of the periodic table corresponds to what energy level in the atom?