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First one to know that there was an atom
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Came up with atomic theory's
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He created the periodic table
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Created an dynamic theory of elements
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Coins the word "electron" as a fundamental unit of charge
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Showed that Cathode rays are composed of electrons and who measured the ratio of change to mass for the electron.
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Ernest thought of the atom having a central positive nucleus surrounded by negative orbiting electrons.
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He classified that electrons travel in stationary orbits defined by their angular momentum and electrons have the lowest level.
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Description- He argued that the x-rays should depend on the charge on the nucleus . So that means the atomic number was equal to the positive charge.
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He contributed my developing the mathematics description that describe the paths of electrons would most likely follow in their orbits around nucleus
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James Chadwick proved the atomic nucleus contained a neutral particle which had been proposed.
