HIstory of the Atom By: Rachel Bown

By RachelBown

  • Start of The American Revolution

    Ended in October 1781

  • Antonie Lavosier

    Most noted for his discovery of the role that oxygen plays in combustion.

  • Independance Day

  • Joseph Proust

    Discovered Law of Definite Proportions.

  • John Dalton

    Determined that each chemical element is composed of a unique type of atom and that the atoms differed by their masses.

  • Louisiana Purchase

  • Amadeo Avagadro

    Hypothesized that equal volume of gases at the same temperature and pressure contain equal number of molecules

  • Asssassination of Lincoln

  • William Crookes

    Discovered cathode rays and their properties.

  • Henri Becquerel

    Studied the effects of x-rays on photographic film.

  • J.J. Thomson

    Studied canal rays and found they were associated with the protein H+

  • Madame Curie

    Studied uranium and thorium, discovered radioactivity, discovered radioactive elements polonium and radium

  • Max Planck

    He used the idea of quanta to explain hot glowing matter.

  • Albert Einstein

    Published E=mc^2

  • Robert Milikan

    Did the oil drop experiment determined the charge and the mass of an electron.

  • Henry Moseley

    Using x-ray tubes determined the charges on the nuclei of most atoms.

  • Niels Bohr

    Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of electrons.

  • Louis deBrogile

    Discovered that electrons had a dual nature-similar to both particles and waves.

  • Werner Heisenberg

    Decribed atoms by a formula connected to the frequencies of spectral lines. Proposed Principles of Determinacy.

  • Erwin Schrodingler

    Viewed electrons as continuous clouds and introduced "wave mechanics"

  • James Chadwick

    using alpha particles discovered a neutral particle with a mass close to proton this was neutron.

  • Pearl Harbor

  • Assassination of John F. Kennedy

  • Landing on the Moon

  • Dolly the Sheep

    Became the first clogned mammal.

  • Democritus

    First to hypothesize that all matter is made of atoms.

  • Aristotle

    About 360 B.C. He claimed that there was no smallest part of matter and that different substances were made of different portions of fire, air, water, and earth.

  • Twin Towers Fell

  • Ernest Ruthford

    Using alpha particles as stomic bullets, probed the atoms in a piece of thin gold foil. He established that the nucleus was; very dense, very small, and positively charged. He also assumed that the electrons were located outside the nucleus.

  • Death of Osama Bin Laden