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Dalton's Theory is that all matter is made of Atoms. Democritus said that atoms are to small and They float in a vacuum called the void.

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Thomson discovered the Electron.

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Cathode Ray experiments

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He proposed that electrons are arranged in concentric circular orbits around the nucleus.

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The quantum mechanical model is based on quantum theory, which says matter also has properties associated with waves.

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Experiments with gases that first became possible at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom based on the following assumptions

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Thomson knew that charged particles could be deflected in a magnetic field.

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Atoms are mostly empty space with a positive nuleus in the center

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Bohr's greatest contribution to modern physics was the atomic model. The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons.

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The quantum mechanical model of the atom uses complex shapes of orbitals, volumes of space in which there is likely to be an electron. So, this model is based on probability rather than certainty.

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Dalton's theory had TWO main flaws according to Dalton's theory, an element is composed of only one kind of atom, and a compound is composed of particles that are chemical combination of different kinds of atoms.

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Electron Location Incorrect

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Electron Location not known

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ohr was not able to explain electron orbits of large atom w/ many electrons.

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It doesn't work for any atom but hydrogen, and even for hydrogen it fails to explain the fine structure.

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Ball

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NP Ball

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Different Ball

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Cooler Ball