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-He made the discovery of the electron in 1897.
-He showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons.

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-Dalton showed that common substances always broke down into the same elements, in the same proportions.
-He concluded that the various compounds were combinations of atoms of different elements each of a particular size and mass that could neither be created nor destroyed.

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-Rutherford concluded that atoms consisted largely of empty space with just a few electrons, while most of the mass was concentrated in the center, which he called the nucleus. He also said that the alpha particles passed through the gaps in the atom but bounced back from the dense positively charged nucleus.
-Experiment: He shot small positively charged alpha particles at a sheet of gold foil. With Thompson's model, the atom's thinly dispersed positive charge would not be enough to deflect the particles in any one place. It would have been like a bunch of tennis balls punching through a thin paper screen. Most of the particles passed through but, some bounced right back which suggested that the foil was more like a thick net with a very large mesh.

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-He says that electrons orbit the nucleus at fixed energies and distances. They can jump from one level to another but they can't exist in the space in between.
-Experiments showed that electrons acted like waves and were not confined to a particular space.

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-Formulated the uncertainty principle.
-He showed that it was impossible to determine the exact position and speed of electrons as they moved around the atom.