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started five priciples, formed the atomic theory, said all matter is made up of atoms.
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Was a oriffessor. warpped a photographic plate wih emulsion and two think black sheets of paper. He put the plate in the sun witch showed the results on a black neggative.
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discovered the elctron, and made the plum pudding model.
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Discovered the charge of the elctron and its mass.
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used gold foil experiment, stated that all mass of an atom were small positily chagred at the center of the atom.
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Demonstrated positive and electric charges.
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Electron may be located.
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Chadwick discovered the third type of subatomic particle.
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Found the atomic mass of an atom.
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Believer in four elements air, earth, water, and fire
