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The first atomic model was developed and Dalton hypothesized that an atom is a solid sphere and can not be divided
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Discovering that the electron was the negatively charge part in an atom.
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shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths
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made the model that depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
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used mathematical equations to describe the likelihood of finding an electron in a certain position.
