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Democritus was the first one to proposes the idea of an atom.
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He did not believe in the atom theory only that elements made up everything.
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He proposed the Atomic theory.
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He discovered the electron, created the cathode ray experiment, also know for the description of the atom as plum pudding.
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Created the fold foil experiment, told us that their was a nuclear in the middle,said that most of the charge was positive.
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He was a student of Rutherford, treated the plan-tarty theory of how electrons move around the nucleus.
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Oil drop experiment helped to fined the mass of the atom.
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He describe the likelihood of finding an electron in a certain position came up with the quantum mechanical model of the atom.
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He discovered the neutron.