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Democritus proposed that all matter is made of tiny indivisible particles called atoms. John Dalton expanded on this with his atomic theory which stated that atoms are identical for each element and combine in fixed ratios. J.J. Thomson discovered the electron through experiments with cathode rays and proposed a "plum pudding" model of the atom. Rutherford discovered the nucleus through experiments where most alpha particles passed through a gold foil but some were deflected, indicating a small, dense cente

Author
o18.maki
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