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History of the Atom

John Dalton Believed atoms were fundamental particles. (nothing smaller than them) Indivisible. Can't be created or destroyed.
Law of Conservation of Mass. Matter is neither created or destroyed in the course of a chemical reaction.
Crookes Cathode rays. (negative plate) Discharge tube, low pressure. Electricity passed through the tube, producing invisible rays travelling in straight lines from the cathode to the anode.
Cathode rays are.. ..streams of negatively charged particles called electrons.
JJ. Thomson Electron. Neg. and pos. plates. Cathode rays. Beam struck a fluorecent screen. Plum pudding model.
Milikan Determined the charge and mass of an electron using charged oil droplets.
Plum pudding model. Pictured the atom as a sphere, which is positively charged and has the negatively charged electrons embedded in it.
Rutherford Gold foil and alpha particle experiment. Discovered the nucleus. Discovered protons..alpha particles ejected positive particles from oxygen and nitrogen atoms.
Chadwick Discovered neutrons..alpha particles ejected neutral particles from beryllium.
Created by: MitchO'N



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