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Asked the question of how small can you get. He then named the smallest of matter atoms.
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Aristotle dismissed the idea of the atom, saying that it was useless. Since Aristotle dismissed this, so did everyone else.
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Learned that matter was infact made of particles, though he did not know the structure.
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Found the electron and knew that they must be negative, and that matter was positive, Made the plum-pudding model.
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Showed that when atoms vibrate strongly, you can only measure in quantas.
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Found that electron circled the atom at certain distance, and that jumping rings causes nuclear reactions.
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Found that electrons circle the atom. Also identified the nucleus and named the partices it consists of protons.
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Finds the electron cloud.
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Discovers the neutron.
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Discovers the quark.