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400 B.C.
Democritus had the idea that all material bodies had atoms. He also believed that atoms where specific to their material.
Greek philosopher.

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In 1803, he revealed the concept of the Law of Partial Pressures.
-English scientist which proposed numerous things about the atom.

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April 30, 1897
J.J.'s experiments found that all atoms have tiny negatively charged particles or electrons.
-British scientist who tested the atom through the cathode ray experiment. He discovered that electrons are negitivly charged in atoms.

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In May 1911, he discovered that atoms have a small charged nucleus surrounded by largely empty space, and are circled by tiny electrons.

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1913
Bohr gave the theory for the hydrogen atom. How he proved this was the explaination that the atom as a small , positively charged nucleus surrounded by orbiting electrons.

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1926
Schrodinger proposed the idea that the quantum mechanical model of an atom.

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In May 1932, he reported the Discovery of the Neutron. He proved the existence of neutrons.
-He identified a particle that was a neutral charge but had the same mass as a proton.