[DGonzo2015]

Why do the Bohr equations only work for hydrogen and helium?  Also, HOW do you prove that it only works for hydrogen and helium?  Thanks in advance.

[Borek]

http://en.wikipedia.org/wiki/Bohr_equation

Seems like it works for all gases

No idea what you are talking about. If you mean Rydberg formula, it works for all hydrogen-like ions, so it doesn't work even for He. If you mean something else, no idea what it is.