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101
Democritus - 400BC
First man to discover the atom -
101
Thales - 600BC
Believed that everything was made up of water. Cosmological Thesis -
101
Aristotle - 400BC
Believed that everything was composed of the four elements, fire, earth, water, and air. -
Sir Isaac Newton
Discovered gravity, laws of motion, and the light spectrum. -
John Dalton
Created the atomic theory of matter -
Henri Becqueral - 1896
Discovered radioactivity -
J.J. Thompson
Discovered the electron. Was known for his experiment Cathode Ray Tube. Made the plum pudding model of the atom. -
Robert Millikan
Made the oil drop experiment. Discovered the mass and charge of an atom. -
Rutheford
Made the Gold Foil experiment which allowed him to discover the nucleus and proton. Made the atomic model called planetary. -
Niels Bohr
Discovered the model of the atom -
Francis Aston
Discovered different isotopes. Used mass spectograph. -
Erwin Schrodinger
Created Schrodinger's model. Predicted where electrons are in the atom, and determined the shape of the electron clouds. -
James Chadwick
Proved nuetrons existed