The Atom by SB

  • Sep 28, 1000

    Democritus

    442 B.C.
    Said everything is composed of atoms.
    They are solid, indestructable, and homogeneous.
    They are different sizes and shapes.
    Changing in groupings of atoms, not the atom itself.
  • Sep 28, 1000

    Aristotle

    Thought if you break a piece of matter again and again, it would at some time stop, and end with a small piece of matter.
  • Antonie Lawosier

    Named Oxygen.
    Proposed law of conservation of mass and the combustion theory.
  • Joseph Proust

    Proposed law of constant composition.
  • John Dalton

    Formed atomic theory.
    Named Thallium in 1861.
    First to identify Helium in 1895.
    Said all matter is composed of atoms.
    Each element has identical atoms.
    Can't be created, divded into smaller particles, or destroyed.
  • Amadeo Avagadro

    Proposed Avogadro's hypothesis.
  • Lincoln Murdered

    He was killed by John Wilkes Booth, when he was at the theater with his wife.
  • William Crooks

    Identified that cathrode rays travel in straight lines.
  • Henri Becquerel

    Discovered radio-activity.
    Discovered some chemicals spontaneously decompose and give off penetrating rays.
  • J.J. Thomson

    Discovered electron.
    1904- suggested model of the atom.
  • Madame Curie

    Studied Uranium and Thorium.
    Called the spontaneous decay process radioactivity.
  • Max Planck

    Used idea of quanta to explain glowing matter.
  • Panama Canal Construction Begins

    48 mile ship canal, that joins the Atlantic Ocean.
    1904-1914
  • Robert Millikan

    7 year study on the electron; discovered its charge.
  • Ernst Rutherford

    Won the Nobel Prize
    Studied charged alpha particles.
    In 1920 proposed exsistence of the 3rd atomic particle, neutrons.
  • Henry Moseley

    Discovered energy of x-rays increased in a linear fashion with each element in the table.
  • Albert Einstein

    Stimulated emission-physical process that makes possible the maser and the laser; same frequency.
  • US Joins WWI

    After the Japenese bombed Pearl Harbor; we got mad and joined
  • Niels Bohr

    Explained atomic structures.
    Atomic model built up of successive orbital shells of electrons.
  • Louis deBroglie

    Said electrons had a dual nature- similar to both particles and waves.
  • Werner Heisenberg

    First to describe atoms.
    Proposed principle of indeterminacy (can't know the position and velocity of an atom).
  • Invention of the Electric Razor

    Jacob Schick (born in Ottumwa, Iowa)
  • Erwin Schrodinger

    Introduced term 'wave mechanics'.
  • James Chadwick

    Used alpha particles to discover a neutral atomic particle.
    The nucleus also contains a neutron; led to atomic bomb.
  • Japenese Bomb Pearl Harbor

    Japenese were trying to prevent us from interfering with their army.
    We were attacked by 353 Japenese.
  • AIDs Discovered

    Affects the immune system.
    Discovered by the US Centers for Diesease Control in 5 homosexual men, in LA.
  • Cold War Ends

    Started in 1946
    Between Communists and the Western World
  • Scientist Clone 1st Human Embryo

    Didn't actually make a person; it was just research
  • 9-11

    2 bombers crashed into the World Trade Center; suicide attacks
    2 other bombers crashed in other places around the country
    Start of the Iraq War (2001-present)
  • Hurricane Katrina

    In the Atlantic
    One of 5 deadliest hurricanes
    At least 1,836 people died
    Hit New Orleans the hardest