Proposed that any matter consists of atomos, Democritus, Said that any matter whatever its nature consists of fire, water, dust, and air, Aristotle, Gave the first definition of element, Boyle, Proposed that elements consists of indivisible solid atoms, Dalton, proposed the plum pudding model, Thomson, Discovered the electrons, Thomson, Used the gold foil experiment to discover the atomic structure, Rutherford

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