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400
democritus
stated that all matter is made up of atoms. He also stated that atoms are eternal and invisible and so small that they can’t be divided -
lavoisier
provided the formula for the conservation of matter in chemical reactions, -
couloumb
formulated the Coulomb's law, which states that that the force between two electrical charges is proportional to the product of the charges -
john dalton
formed the atomic theory, which states that all matter is composed of tiny, indestructible particles called atoms -
crookes
created the Crookes’ tube and demonstrated that cathode rays travel in straight lines and produce phosphorescence and heat when they strike certain materials. -
j.j thomson
discovered the electron and developed the plum-pudding model of the atom. -
ernest rutherford
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.