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Democritus was an ancient Greek philosopher who discovered the atom or as he named it, the "atomos".

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John Dalton discovered the law of multiple proportions. He held an experiment and noted carbon and oxygen form two different compounds with different amounts of carbon and oxygen.

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J.J. Jonah Thomson discovered atoms have negative particles( electrons). Using a cathode raytube for his experiment, Thompson found electrons charge to mass ratio: 1.76x10 C/g

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Ernest Rutherford found out that atoms orbit the nucleus. That same year Neils Bohr added on to Rutherford's theory saying electrons orbit the nucleus.

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very accurate model Schrodinger made himself in 1924.

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Erwin Schrodinger discovered the wave mechanical model saying that electrons act like particles and waves

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Werner Heisenberg discovered the uncertainty principle. The principle explains that we can't know the speed and position of an electron

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James Chadwick discovered neutrons. During an experiment Chadwick bombarded beryllium atoms with alpha particles and discovered atoms with no charge.