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The Solid Sphere Model was the first atomic model and was developed by John Dalton in the early 19th century. He came up with his theory as a result of his research into gases.
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The Plum Pudding Model is a model of atomic structure proposed by J.J. Thompson in the late 19th century. Thompson discovered that atoms are composite objects.
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Rutherford overturned Thompson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.
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In 1926 Erwin Schrödinger, an Austrian physicist, took the Bohr atom model one step further. Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position.