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10 terms

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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