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Law of Definite Proportions
Joseph-Louis Proust conclude that every chemical compound contains fixed and constant proportions of its constituent elements. -
Cathode Ray Tube
Fires electrons at a screen of phosphors (not phosphorous) to produce an image. -
J.J. Thomson
Discovered the electron. Proposed the plum pudding model of the atom, as a positively charged body scattered with the negatively charged electrons. -
Plum-Pudding Model
J.J. Thomson proposed his atomic theory that atoms were a positively charged fluid scattered with negatively charged electrons. -
Robert Millikan
Experimented with droplets of oil to discover the exact charge of an electron. -
Gold Foil Experiment
Fired alpha particles at a piece of gold foil, some of which bounced back, disproving Thomson's idea of the plum pudding model. -
Bohr Planetary Model
Proposed by Niels Bohr, this model suggests that the atom has a superdense nucleus of protons and neutrons, orbited by electrons in a regular motion. -
Erwin Schrodinger
Won a Nobel Prize for making many important contributions to the field of Quantum Mechanics. -
Lise Meitner
Publishes the results of her experiments on radioactive substances, discovering nuclear fission and proving that nuclei aren't static.
