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Chem Quiz

TermDefinition
John Dalton English Scientist, 1803
JJ Thomson English Scientist, 1897
Robert Millikan American Scientist, 1909
Ernest Rutherford English Scientist, 1912
Neils Bohr Danish Physicist, 1913
Eugen Goldstein German Physicist, 1885
James Chadwick English Scientist, 1932
John Dalton(description) 5 Postulates to his theory, all matter is made up of small indivisible particles called atoms, atoms cannot be created nor destroyed in chemical reactions
JJ Thomson(description) Did research with a cathode ray tube, discovered the electron, his model is called plum pudding: all electrons and protons are evenly distributed
Robert Millikan (description) Determined the charge of an electron with oil drop experiment: suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces.
Ernest Rutherford(description) Did the gold foil experiment: When he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected. He concluded that a tiny, dense nucleus was causing the deflections.
Neils Bohr(description) Solar Sytem model: Depicts atom as small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
Eugen Goldstein(description) Used a cathode ray tube filled with hydrogen gas and discovered the charge and mass of a proton
James Chadwick(description) Found evidence for existence of the neutron and the discovery of what makes up the total mass of an atom, experiment:Beryllium, when bombarded by alpha particles, emitted a very energetic stream of radiation, electrons mass is negligible
Created by: roboticme