I have always heard that the inconsistency in explaining atomic models with classical mechanics was that the study of electrical charges had shown that whenever a charge is accelerated, it emits light (and thus there is no way to sustain circular movement of electrons around a nucleus).
Since then it seemed interesting to me the possibility that perhaps a very natural/commonplace phenomenon in which we can see light emitted from an accelerated charge could be lightning. But then it also occurred to me that perhaps the light of lightning is caused by the chemical reactions that happen in the path of the ray (oxygen is converted to ozone if I am not mistaken, there may be others).
I did try to search the internet a bit, but at simple glance at least the answer seemed not to be obvious. Does anybody here know which case is it? what other common or interesting cases of light emission due to charge acceleration are there?
NOTE: I am tagging this as quantum mechanics because, like I said before, the most likely place I think this information might come up other than when studying electrodynamics is as a motivation on the development of the quantum theory. Please mods feel free to modify it if you disagree or think other tags should apply and apologies for any inconvenience.