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He discovered the atom. It was just a theory he though tit looked like a heavy,hard ball.
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Dalton's theory was the atomic theory and thought that all matteris composed of tiny individual elements.
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Thomson's theory is called the Plum Pudding model and he said that elecrons are surronded by positive charges
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Rutherford used the gold foil experiment adn found out the atom is a tiny heavy nucleas he tought the atom looked like a central charge surrounded by a cloud of orbiting electrons.
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Bohr used the bohr model to discover that the atom is a small positively charged nucleaus. Bohr thought the atom looked a nucleaus surrrounded by electrons that swarm in many different orbits.
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They discovered that electrons do not travel in neat orbits and they did this using the uncertainty principle. They thought a atom looks like a nucleaus swarmed by electrons.
