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He believed that everything was made of water.
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First man to believe the atom was made of a circle, thought of the atom.
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Believed that everything was made of Earth, Air, Fire, and Water which are the main elements./
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He said matter is atoms, indivisible and indestructible. All atoms of elements are identical, and atoms of different elements are different. They cannot be created or destroyed.
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Discovered radioactivity and did the Uranium Experiment
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Discovered the electron and did the Cathode Ray Tube experiment.
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He had the oil drop experiment and determined the charge and mass of the electron.
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He discovered the nucleus and the proton. He also did the gold foil experiment to figure out that some things did not go all the way through the foil and some bounced back which was a nucleus.
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Found that the electrons follow a path , mainly found the Bohr model.
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Mass spectograph and discovered isotopes.
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Created Schrodinger model and had the electron clouds.
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Plum Pudding model
Proved the existance of nuetrons -
He had the first physical experiment and contributions are Laws of Motion, Light Spectrum, and thought Democritus was right.