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John Dalton knew atoms had different masses and values but described the atom as one sphere with one charge.

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JJ Thomson realized there were positive and negative charges in the atom. He thought that there was one positive charge in the center and lots of negative charges throughout and around it.

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Ernest Rutherford centered the positive charges in the nucleus of an atom and the electrons surrounding it.

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Niels Bohr found the electron orbit which contains the electrons circling the nucleus.

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Modern day atom