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624 B.C. ; Thought all things were made of water
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460 B.C. ; First person to think of atom. Thought it was a solid sphere.
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384 B.C. ; Didn't believe in atomic theory. Thought everything was made up of water, earth, air, and fire.
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Matter formed of solid, liquid, and mass
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Matter is atoms
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Discovered radioactivity
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Discovered the electron
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Found mass and charge of the electron
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Discovered nucleaus
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Discovered how eletrons travel around nucleaus.
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Mass spectograph
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