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John Dalton discovered the atomic theory. The atomic theory is a theory that all matter is made from small invisible particles.
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Mendeleev was credited for creating and discovering the table of elements.
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JJ Thomson was credited with discovering the atomic model, he also discovered that for every negatively charged atom there was a positively charged one.
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Ernest Rutherford was also known as the father of the Nuclear physics, but he discovered positively and negatively charged atoms, he also credited with the gold foil experiment.
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Bohr won a Noble Prize for his work in discovering the atomic structure.
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James Chadwick was a physicist that was credited with discovering the neutron.
