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Dalton comes up with the idea of small particles. He decided that all matter is made of atoms, and he came up with the idea of two or more kinds of atoms equalling a compound. He also said a chemical reaction is a rearrangement of atoms. His discovery wsa the bases of all the discoveries to come.
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He comes up with the idea of electrons and their negative charge.
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He published a model with a central positive nucleus surrounded by negative orbiting electrons.
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He realize the Ernest Rutherford's model was untrue according to the laws of classical physics. He said that radiation is emitted from atoms not from the periodic motion of the electron in it's orbit.