Question

do electrons occupy a single energy level?

Answer 1

I don't think so.

Answer 2

ur sure

Answer 3

They can go to different energy levels

Answer 4

Just think of the Lyman series for example

Answer 5

Yes I am sure, in fact the energy of an electron depends on the energy of a photon its interacting with. When an electron absorbs a photon, the electron gains energy and momentum, when emitting a photon, the electron loses energy thus going down to a lower energy level.