said that matter was made up of tiny indivisible particles called "atoms"
developed Law of Coservation of Mass-Matter can neither be created nor destroyed
Developed Law of constant composition- chemical compounds always have same whole # ratios
used cathode ray tube ->negative particles (electrons) exist
used oil drop experiment->negative charge on electron
Cathode Ray Deflection->found mass to charge ratio of the electron; plum-pudding model
Gold foil experiment->nucleus
planetary model of the atom; emission spectrum; nucleus has protons, elctrons and was orbited by electron in orbits