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John Dalton was the first to adopt Democritus theory into the first modern atomic model..
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Sir J.J Thomson gave the first model of atom.
He by means of cathode-ray experiment discovered the existence of negatively charged particles in an atom which led to the discovery of electrons.
He gave the plum-pudding model of an atom in which electrons are embedded in atom-like currants.
Positive electrons are distributed all over the atom.
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