In this question about absorption of continuous energies by discrete atom states, one of the reasons given to explain the width of spectral lines is the uncertainty principle (natural broadening): the decay of an electron from an excited state emits a photon with an uncertain energy (until observed) within a certain range.
In order to respect energy conservation, does that mean that the energy levels of ground and/or excited states in an atom also have uncertainty (and thus, a continuous range of possible energies for each level, instead of a unique energy value)? As the electron can decay between two excited states, not necessarily to the ground state, I would expect that to be at least true for excited states.
However, this page gives energy values for the ground and first excited states of hydrogen electron without any range: I'm not sure if that means that there's no range (and thus, no uncertainty), or if there's simply no need to indicate it (not useful, can be calculated from the theory, ...).
Wikipedia states that both ground and excited states are quantum states, but I don't know if that necessarily implies that all associated "properties" are subjected to uncertainty.