Energy of shells vs. subshells

[josephyim1L]

Does the energy of a 2s electron lower than the energy of a 2p orbital? In essence, can electrons with the same principle quantum number have higher or lower energy levels than each other?

[Samantha Ito 2E]

I believe that s- electrons have a lower energy than p- electrons within the same shell.

[Neil Hsu 2A]

In a given energy level, the energy of the subshells follow the order of s<p<d<f, given that the energy level has those subshells. However, if the orbitals are degenerate, then the orbitals in all the subshells in a given energy level would be the same energy. In other words, in hydrogen, energy level 2 is degenerate, meaning that the orbitals in the 2s subshell and those in the 2p subshell have the same energy.