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Aristotle did not believe in the Atom Theory discovered by democritus. Aristotle believed that all matter was made of the four elements, Fire, Earth, Air, and Water. He did not have any proof for his theory. The Atom Theory had no proof too. People believed Aristotle because Aristotle was one of the greatest minds.
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John dalton was born. His father was a poor weaver who made just enough to feed his family.
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John Dalton developed the atomic theory in 1800. He thought that the atom was the smallest unit of matter and could not be broken down. He thought that the atom was a sphere kind of like a marble. Dalton also calculated the atomic mass of atoms.
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JJ Thompson discovered the electron using the cathode-ray tube.
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In 1904, Thomspn thought the atom was a shere with electrodes around it. This was called plum pudding model.
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Robert Millikin found the charge of a single electron. He did this by using hiis famous oil drop experiment.
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Ernest Rutherford discovered the nucleas. He thought that the atom hada positive nucleus with negative electrons around it. he was also the student of JJ Thomson.
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Ernest Rutherford used his gold foil experiment to prove his theory.
