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John Dalton
started five priciples, formed the atomic theory, said all matter is made up of atoms. -
Henri Becquerel
Was a oriffessor. warpped a photographic plate wih emulsion and two think black sheets of paper. He put the plate in the sun witch showed the results on a black neggative. -
J.J. Thomson
discovered the elctron, and made the plum pudding model. -
Robert Millikan
Discovered the charge of the elctron and its mass. -
Ernest Rutherford
used gold foil experiment, stated that all mass of an atom were small positily chagred at the center of the atom. -
Niels Bohr
Demonstrated positive and electric charges. -
Quantum Model
Electron may be located. -
James Chadwick
Chadwick discovered the third type of subatomic particle. -
Marie and Pierre Curie
Found the atomic mass of an atom. -
Aristotle
Believer in four elements air, earth, water, and fire
