Ok, so what I considered to be true for quite some time now has been somewhat tarnished after something that was said recently in a lecture, so I am looking for some insight. Basically, I was told several times by several teachers/professors over the years that when an electron absorbs a photon, and moves to a higher energy state, the distance between the electron and the nucleus increases. (Obviously there is a probability, and I know of the electron cloud and such, but basically the higher energy state makes it more likely that the electron is further out) This was then used to demonstrate that at a high enough energy state, the electron would be "shot" out, and become a free electron, and the atom would become ionized. The logic being that the energy added by the photon was so high that the distance between the nucleus and electron was too great for the nucleus to "pull it back in." (again, we are talking figuratively) This was also used to show why heavier elements were typically easier to rip electrons from, as the valence shell was much further away from the nucleus. Now then, fast forward to the last week. It was stated that the electron was not capable of physical movement, and although the electron could be anywhere in the cloud, the probability was rather fixed into set orbitals. When I inquired about the above statement, it was flat out said that the increase in energy does not change the charge of the electron, so would not change the distance, and that a change in charge that WOULD change the distance, would have an acceleration and therefore a movement, which wasnt possible. So now I am quite confused on which is actually correct. Thanks in advance to anyone that can help with this, as it has sort of messed with my head, being that something I "knew" for a long time might actually be very false.