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Did experiments with several chemicals and came to the conclusion that matter seemed to consist of lumpy particles. He didn't know much about it except that it was something fundamental.
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Thomson discovered the electron. He knew that they had a negative charge and made a model of the atom.
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Rutherford did experiments and found out that there was a positive charge in an atom, which he later named proton. He knew that the electrons orbited the nucleus from a far distance.
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Bohr said that electrons can orbit the nucleus but only from certain allowed distances. He also stated that only one electron can exist in an orbit.
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Schrodinger used mathematical equations to estimate where an electron would be located. He assumed that matter could be both particles and waves.
