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Democritus

said that matter was made up of tiny indivisible particles called "atoms"

Lavoisier

developed Law of Coservation of Mass-Matter can neither be created nor destroyed

Proust

Developed Law of constant composition- chemical compounds always have same whole # ratios

John Dalton

Atomic Theory

Crookes

used cathode ray tube ->negative particles (electrons) exist

Milikan

used oil drop experiment->negative charge on electron

J.J. Thomson

Cathode Ray Deflection->found mass to charge ratio of the electron; plum-pudding model

Ernest Rutherford

Gold foil experiment->nucleus

James Chadwick

discovered neutron

Neils Bohr

planetary model of the atom; emission spectrum; nucleus has protons, elctrons and was orbited by electron in orbits

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