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Chemistry- People

People in Chemistry who were involved in Atomic Theory and the Periodic Table

WhoWhatWhenAnything else useful to know
Democritus Said that all matter is composed of "atomos" 4th Century BC Founded the "Atomists" school of though, and the first (?) to propose the idea of atoms.
John Dalton _____'s Atomic Theory (5 laws) 1766-1844 (lived) Some of it has been proved false, but it is still very similar to the modern view of atoms.
Sir J. J. Thomson Discovered electrons, proposed "plum-pudding atom" (e.'s imbedded in pro.'s) 1897 Discovered using cathode ray, gases in glass tubes with discs at either end.
Robert A. Millikan Calculated mass of electron 1868-1953 (lived) Mass is 1/1840 of the mass of hydrogen
Aristotle Everything is composed of 4 basic elements- earth, wind, fire, water Ancient Greece? (blank)
E. Goldstein Discovered protons 1886 Technique similar to cathode... canal rays instead
Ernest Rutherford Discovered that there is a "dense, positivly charged region" 1911 Didn't call it a nucleus. Discovered by flinging alpha particles at gold foil, expecting them to go through. They bounced instead.
Bohr Said that electrons travel in concentric circular paths around the nucleus, with fixed amount of energy for each level. (none given) Closest to modern. Problem is that his theory only applies to Hydrogen.
Erwin Schrodinger Came up with a mathmatical equation for the location and energy of electrons in a Hydrogen atom 1926 The QMM comes from the solution to the equation.
Dmitri Mendeleev Arranged elements by properties and mass 1834-1907 (lived) (blank)
Henry Moseley Arranged elements by atomic number 1913 (blank)
Canizaro Developed a consistant way of finding atomic mass (blank) (blank)
Created by: Bookish
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