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Who were the first people to come up with an atomic theory?

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Wiki User
02/14/2014

It depends. If you mean just any old atomic theory, credit usually goes to either Democritus or his mentor Leucippus.

However, if you mean an atomic theory that wasn't totally blowing smoke out their nether regions, was backed up by actual experimental data, and at least resembled the truth in certain ways if you squinted hard enough, I'd say John Dalton is probably your guy.