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History of the Atom Picture Timeline
(Not Finished) Scientists and experiments in order
8 Oct 2017
Democritus (Greek Philosopher) 460 BC *Came up with the term Atom (Atoma) *Divided paper until it was no longer possible
Isaac Newton (1704) *Proposed a mechanical universe with small solid masses that continuously move
John Dalton (1808) *Proposed his atomic theory based upon measurable properties of mass called Dalton's Atomic Theory
Dalton's Atomic Theory 1) Law of Conservation of Mass 2) Law of Definite Proportions 3) Law of Multiple Proportions
William Crookes (1870) *Invents Cathode Ray Tubes
J.J. Thomson (1897) *discovered negatively charged particles called Electrons using a Cathode Ray with magnets
Cathode Ray tube experiment *Involved using magnets -negative side repelled -positive attracts
Robert Millikan (1909) *Measured the charge of the electron by doing the Oil Drop experiment
Oil Drop Experiment . . .
Plum Pudding Model *First complete model of an atom . . .
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