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He said if you keep cutting bread (or an object) in half it would get too small to cut in half and that was an atom. 400 B.C

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He said that all matter is made up of four elements, fire, air, water, and earth. 322 B.C

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Dalton found out how to measure atomic weight and had the first atomic theory in over 2000 years. 1803

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Discovered the electron and changed the whole atomic theory by adding negative and positive charges to an atom. he was later proved wrong because there was also neutral charges. 1897

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He redesigned our view of an atom, had the theory that an atom is mostly empty space, and added the nucleus to the atomic model. 1908

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He proposed that electrons do not circle the nucleus at random orbits but orbit the nucleus at fixed distanced farther away from the nucleus. 1913

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He discovered the neutron. 1932

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Schrodinger, Heisenberg, Einstein and others 

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Schrodinger, Heisenberg, Einstein and others 

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They made the theory that electrons orbit the nucleus at a fast pace and not like a planet. 20th century