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Discovered the existence of neutrons. He found that the atomic mass of most elements is double the number of protons for one atom of that element.

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Used mathematical equations to describe the likelihood of finding an election in a certain position. (The quantum mechanical model of the atom)

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Discovered that atoms have a positive charge in the core and negative charges outside the core. Atoms are mostly made of space.

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Made an oil drop experiment which helped to quantify the charge of an electron. It showed the structure of an atom and atomic theory.

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Discovered that atoms can be split into smaller particles (protons and electrons)

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Created the Goldstein Canal Ray tube, this tube demonstrates that besides the cathode rays there is another stream that travels in the opposite direction as the electron flows.

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Found out electrons travel around the nucleus of an atom in definite paths. Electrons can jump from one energy level to another

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Found out that atoms of the same element are exactly alike, atoms of different elements are different. Atoms can join with other atoms to make new substances.

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Was the first to suggest the idea of an atom. He had no evidence for it.