Hi everyone, i am a new member here. I really liked this web site and i would like to thank everyone who's registered here. I have a quick question in chemistry and i really would like to know the answer of it. the answer would be really appreciated from whoever is going to answer it for me and thanx so much. my question is as the following: q. what experimental evidence requires that the emission of energy by an atom be quantized? (waiting for ur responses) that's it for now... and have a nice day everyone.