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Thomson discovered the electron, by using crooks tubes by showing it was negatively charged particular in neon gas.

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Schrodinger took Bohr model and changed it by using mathematical equations to describe the likelihood of finding an electron in a certain position.

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Rutherford atomic model could not explain the chemical properties of elements, he finds that an atom has a small, density positively charged nucleus. Electrons move around the nucleus.

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Milken actually created an oil drop to help discover the charge of an electron into numbers.

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Goldstein discovered protons and he found out they are attracted to electrons

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Democritus was the first to suggest the idea of the Atom. He did have theory and evidence. He belived that matter consisted of tiny, invisible, unchangable particles called atoms.

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Dalton depicted atoms as tiny particles. he had his own theory as shown in the image below.

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Bohr proposed that an electron is found only in specific circular paths, or orbits around the nucleus. In his model the electron moves in circular orbit at fixed distances from nucleus.

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Chadwick confirms the existence of neutrons, which have no charge.