# Are the 2s and 2p subshells degenerate in the He+ ion?

I know that the 2s and 2p (as well as 3s, 3p, and 3d) electron subshells are degenerate in the hydrogen atom. I was wondering if they are also degenerate in other one-electron species, such as the $\ce{He+}$ atom.

• He+ is pretty much the same as H. – Ivan Neretin Aug 20 '18 at 20:19
• I'd point out that there is only one 2s orbital so it can't be degenerate. The various p, d, and f orbitals can be, and they are degenerate in the $\ce{He+}$ atom in the ground state. However if the electron is in a 2p orbital say, then the other two are degenerate, but the one with the electron has a different energy. – MaxW Aug 20 '18 at 20:34
• @MaxW Sorry, I meant subshells, not orbitals. I know that the 2px, 2py, 2px orbitals are degenerate, but I was wondering if the 2s and 2p subshells are degenerate in all one-electron species. – user8081591 Aug 20 '18 at 21:18