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Dalton
Proved existence of the atom, created 5 atomic theories. Via studying gases
Democritus
Created first idea of the atom, and called it the atom.
Chadwick
Discovered neutrons. Via comparing mass of atoms.
Rutherford
Discovered Nucleus. Via Gold Foil Exp.
Thompson
Discovered electrons. Via Millikan’s invention.
Millikan
Built invention that can measure charges w/in an atom.
Note 
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