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Democritus made the discovery of the atom and found out that everything is made up of them.
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John Dalton made the theory that is still being used today in modern theory.
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Arranged all the elements into a periodic table of elements. He did it when people noticed relations with masses.
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Goldstein made the discovery that there was a positive charge in the atom and it is called the proton.
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Thompson made the discovery of the negativly charged electron and also made a plum pudding model.
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Rutherford made the discovery that the atom was mainly made up of empty space. He also found out that it has a nucleus.
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Had the oil drop experiment which helped show us the charge of the electron.
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Helped make the equations for the quantum mechanics.
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Made the model of the atom called the quantum mechanical model. He made it using math equations.
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Chadwick found out that there was a neutral charge that was called the neutron located in the atom.
