Atomic Structure Models

Robert Millikan

oil drop experiment, measured exact charge of electron, allowed charged tiny oil droplets to pass through a hole into an electric field

J.J. Thompson

cathode ray tube experiment, atoms consist of charged and negative particles, plum pudding model

Ernest Rutherford

gold foil experiment, planetary model, discovered protons

John Dalton

all matter has atoms, atoms of one element cannot convert to another element, atoms of element identical in mass + properties, compounds = specific ratios, not created/destroyed