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Called the atom an atom because in Greek atom means invisible. He called it this because he thought it couldn't be broken down into smaller parts.
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Dalton concluded that the sizes of the particles making up different gases are different.
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Thomson discovered the electrons. He discovered them by showing cathode rays that were particles with a negative charge, and it was much smaller than an atom.
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Rutherford and his team shot alpha-particles on a gold foil. This showed the atom had a central charge
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Bohr's experiment showed electrons jump between energy levels by using many ideas of Rutherford's, and this is why it's called the Bohr-Rutherford model.