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400
democritus, greece
He said that all matter is made from atoms and he also said that atoms are indivisble he also said that they are so small they connot be cut any smaller. -
John Dalton, England
john dalton creatend the atomic theory wchich states that all matter is created from tiny little particles called atoms and they are inderstructible and they all have the same atomic weight. -
J.J Thomson, England
discovered the electron and developed the plum-pudding model of the atom. -
Ernest Rutherford, England
Used the results of his gold-foil experiment to state that all the mass of an atom were in a small positively-charged ball at the center of the atom.
