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Thought all things were mad of water.
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First person to think of the atom. Thought it was a solid sphere.
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All substances were made of fire, water, earth, and air. No Atomic theory.
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"Matter is formed of solid, massy impenetrable particles.
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The Atomic THeory. First person to have experiment evidence.
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Discovered radioactivity.
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Discovered electron. Cathode Ray experiment.
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Discovered the nucleus. Gold Foil Experiment.
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Found the charge of an electron.
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Electtrons orbit around the nucleus.
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Improved Bohr's model. Quantum Mechanical model.
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Proved the existence of neutrons.