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John Dalton published his first general account of chemical atomic theory, a cornerstone of modern chemistry. The theory originated in his earlier studies of the properties of atmospheric gases.

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JJ. Thompson recognize of the discovery of the electron, he purposed the plum pudding model of the atom, which had negatively charged electrons embedded within a positively charged ones

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Rutherford discovered the atomic nucleus using a "scattering" experiment, diagramed at right, that would become a classic technique of particle physics.

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Niels Bohr proposed a theory for the hydrogen atom, based on quantum theory that some physical quantities only take discrete values. He also pruposed another model of the atom, consists of a small, dense nucleus surrounded by orbiting electrons.