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The first atomic model. Developed by John Dalton. Dalton hypothesized that an atom is a solid sphere that could not be divided into smaller particles.
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One of several historic scientific models of the atom. Proposed by J.J. Thomson. He proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."
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Earnest Rutherford disproved J.J. Thomson's model of the atom as a uniformly distributed substance. Rutherford saw the atom as a miniature solar system with electrons orbiting around a massive nucleus.
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Presented by Niels Bohr and Ernest Rutherford as a system consisting of a small, dense nucleus surrounded by orbiting electrons which is similar to the solar system but with attractions provided by electrostatic forces
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Erwin Schrodinger proposed the quantum mechanical model of the atom, which treats electrons as matter waves. Electrons have an intrinsic property called spin, and an electron can have one of two possible spin values - up or down.