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Democritus everything is made of small items

Aristole belived that all matter was made of four elements earth,air,fire,water

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In 1766-1844 John Dalton believed all atoms of an element are identical and have the same mass

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In 1987 J.J Thomson used a cathode ray tube

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In 1911 Ernest Rutherford atoms are mostly empty space

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In early 1900s protons are in the nucleus and electrons are located in pathways around the nucleus

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This aspect of the quantum theory made Schrödinger and several other physicists profoundly unhappy, and he devoted much of his later life to formulating philosophical objections to the generally accepted interpretation of the theory that he had done so much to create. His most famous objection was the 1935 thought experiment that later became known as Schrodinger's cat

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James Chadwick discovered the last subatomic particle in 1932