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Dalton, an English chemist, physicist, and meteorologist hypothesized that atoms were solid spheres. Brilliant.
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J.J Thomson, an English physicist, hypothesized that there was more than just a solid sphere going on when talking about atoms. He discovered that there were negatively and positively charged particles that were in the composition of the atom and that the negative charged particles were smaller than the atom itself
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Ernest Rutherford, a New Zealand born physicist, proved J.J Thomson's Plum Pudding model to be incorrect. His theory was that the atom was a very small and dense, positively charged core called the nucleus with electrons spinning around in fixed orbit like the planets.
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In 1913, Niels Bohr, a Danish physicist corrected Rutherford's theory by creating one showing that electrons could have a stable orbit. In Rutherford's, electrons would have lost energy and spiraled into the nucleus.
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In 1926, an Austrian physicist Erwin Schrodinger took Bohr's theory one step further by creating the Quantum Mechanical Model which said that an atoms electrons did not move in an orbit like rotation, but instead moved around randomly. The Quantum Mechanics Model gave possible positions of where an electron could be at any time.
