I've seen a lot of explanations of electron excitation by photons in the Bohr model but they all use a hydrogen atom which only has one electron. How does the excitation work for atoms with more electrons and thus more energy levels?
It should follow the same rules as the hydrogen atom's electron if the excited electron is in the last energy level of the atom.
But what if a photon with the right energy hits an electron in one of the lower energy levels, will it jump to a higher energy despite there already being electrons of higher energy in the atom? What if the energy level it should jump to is full?