-
400
Aristotle
Aristotle stated that all substances were made of the 4 elements,water earth fire and air. -
400
Democritus
Democritus proposed the existance of atoms and said they were real -
John Dalton
John transfromed Democritus' ideas on atoms into a scientific theory. -
J.J. Thomson
Thomson discovered the electron, and conducted the cathode ray tube experiment. -
Robert Milikan
Milikan determined the massand the charge of the electron, and conducted the oil drop experimant, -
Period: to
lff
