Atomic Structure

Timeline created by kscmlc
  • 400

    Democritus

    Democritus
    400 B.C.
    Matter was composed of atoms that could be divided no further
    atomos= greek for indivisible
  • Jan 1, 1000

    Helpful Videos

    Changes of the Atom<a
    href='http://www.youtube.com/watch?v=ZnKqiojoFJU' >Atomic Theory Rap</a><a
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  • Lavoisier

    Lavoisier
    Made measurements of chemical change in a sealed container
    Found law of conservation of mass (matter): when a chemical reaction occurs, mass is neither created nor destroyed but only changed.
  • Proust

    Proust
    Regardless of the source of Water it always contain these same percentages of Hydrogen(11%) and Oxygen(89%).
  • Dalton

    Dalton
    dalton Atomic TheoryAtomic Theory:
    1. Matter is composed of tiny indivisible particles known as atoms
    2. Atoms of the same element are identical and atoms of any one element are different from those of another element
    3. Law of Conservation of Mass: Reactions occur when atoms are seperated from one another, joined or rearranged but matter can not be created or destroyed.
    4. Atoms of different elements can combine in whole number ratios to form compunds.
    Law of Definite Proportion
    Law of Multiple Proportion
  • J.J. Thomson

    J.J. Thomson
    Plum Pudding
    Created the cathode ray tude
    Electrons- negitivitly charged particles
    Protons- positively charged particles
    Plum Pudding Model: electrons surrounded by a soup of protons, like negatively-charged "plums" surrounded by positively-charged "pudding"
  • Rutherford

    Rutherford
    Gold Foil
    In the gold foil expeiment, Rutherford correctly deducted that most of the remainder of the atom was empty space. Rutherford termed his discovery "the central charge" later named the nucleus.
  • Milikan

    Milikan
    Oil Drop Experiment
    He created the oil drop experiment. From the oil drop experiment he determinded the charge of the electron. His conclusion was the mass of one electron is 1/840 the mass of a proton essentially the electron has no mass.
  • Chadwick

    Chadwick
    Chadwick
    Chadwick won the 1935 Nobel Prize in Physics.
    He proved the existence of the neutron.
    Chadwick's later experiments with particle accelerators contributed to the invention of the nuclear fission bomb.