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  1. Millikan Oil Drop Experiment + Millikan
    • - Preformed by Robert Millikan
    • - Determined the size of the charge on an electron
    • - Determined that it was the smallest unit charge/quantized charge
    • - Put a charge on a tiny drop of oil, and measured how strong an applied electric field had to be in order to stop the oil drop from falling
    • - Noticed that the charge on a single electron was always a multiple of 1.6x10 -19C
  2. The Rutherford Experiment + Rutherford
    • - Preformed by Ernest Rutherford
    • - Determined that an atom was a central positive nucleus surrounded by negative orbiting electrons
    • - Most of the mass of the atom was contained in the small nucleus, the rest was mostly empty space
    • - They came to a conclusion following the results of his famous gold foil experiment
  3. Becquerel
    • - Antoine Henri Becquerel: a French scientist conducted an experiment w/ the exposure of an uranium-bearing crystal to sunlight
    • - It had a photographic print of a crystal
    • - Discovered radioactivity
  4. Crookes
    • Sir William Crookes discovered:
    • - The element thallium
    • - A negative charge in atoms
    • - Reconstructed the Cathode Ray
  5. Chadwick
    • - James Chadwick proved the existence of neutrons in 1932
    • - Established that the atomic number is determined by the number of protons in an atom
  6. Curie
    • - Marie Curie and her husband (Pierre Curie) discovered the radioactive elements Polonium and radium in the pure state in 1902
    • - Discovered that the ability to radiate did not depend on the arrangement of atoms in a molecule, and that it must be linked to the interior of the atom itself
    • - Discovered that the strength of the radiation depended on the amount of uranium or thorium
  7. Dalton
    • John Dalton's atomic theory:
    • - All matter of made of atoms, which are indivisible and indestructible
    • - All atoms of any given elements are all identical to each other and different from the atoms of other elements
    • - Compounds are formed by a combination o two or more different kinds of atoms
    • - In a chemical reaction, atoms are separated, rearranged, and recombined to form new compounds
  8. Geiger
    • - Johannes Wilhelm Geiger (Hans Geiger) invented the Geiger counter, which was a detector or radioactivity
    • - Worked with Rutherford
    • - They devised a counter for alpha particles
    • - The usage of the experiment led to the identification of the alpha particle as the nucleus of the helium atom
  9. Joliot-Curie
    • - Daughter of Marie and Pierre Curie
    • - Created new radioactive elements by bombardment of alpha particles on various light elements
    • - Experiment produced isotopes of stable elements like nitrogen, phosphorus, silicon, and aluminum
  10. J.J Thomson
    - Discovered the electron in 1897, proved using the Cathode Raytube

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2014-05-14 08:33:59

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