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460
Democritus
Democritus states all matter is made of particles -
Period: 460 to
Scientists
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John Dalton
Atomic Theory- all matter is composed of atoms -
Marie Curie
Discovered new elements -
JJ Thomson
Cathode Ray Tube -
Robert Millikan
Charge of the electron -
Ernest Rutherford
Gold foil experiment -
Neihls Bohr
solved negative electron problem -
Albert Einstein
Manhattan Project