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John Dalton believed that element are made of atoms. He said different elements have different atoms. He thought compounds are made of different elements.
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Ernst discovered that alpha particles have a positive charge. The alpha particles either reflected of went through the gold foil.
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Thompson discovered cathode rays. He found out the charge of an electron is negative. Electrons move from the negitive end to the positive end.
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Bohr believed that all electrons are the same. He believed electrons orbit the nucleus.
