• Jan 1, 1000


    First person to propose that matter was not infinitely divisible. Lived from 460-370 b.c.
  • Jan 1, 1000


    Said atoms move through empty space. Lived from 384-322 b.c.
  • Antonie Lavosier

    Discovered oxygen.
  • Joseph Proust

    Formulated the law of definite proportions.
  • John Dalton

    Developed Dalton's Atomic Theory
  • Amadeo Avagadro

    Hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules
  • J.J Thomson

    Determined charge to mass ratio. Concluded that mass of a charged particle was much less than that of a hydrogen atom. In the late 1890's.
  • William Crooks

    Discovered cathode ray that led to the invention of the television.
  • Henri Becquerel

    Discovered of natural radioactivity
  • Henry Moseley

    Atoms of each element contain a unique positive charge in their nuclei
  • Max Planck

    Discovered the quantum theory.
  • Cuba

    Cuba gained independence from Spain
  • Robert Millikan

    Calculated mass of a single electron.
  • Madame Curie

    Discovered radioactivity, polonium and radium.
  • Niels Bohr

    Discovered that atoms contain of a nucleus at the center and is surrounded with electron shells.
  • Albert Einstein

    Developed theory of general relativity. Formula led to atomic bombs and nuclear power.
  • Ernest Rutherford

    Concluded a nucleus contained positively charged particles called protons.
  • Louis deBroglie

    Discovered that electrons could behave as waves
  • Werner Heisenberg

    Created quantum mechanics.
  • China

    Chiang Kai-shek becomes leader of China's revolutionary party following the 1925 death of Sun Yat-sen.
  • James Chadwick

    Showed that nucleus contained neutrons.
  • Battle of the Bulge

    Battle of the Bulge begins as Germans penetrate Allied front in Belgium (Dec. 16 to Jan. 1945).
  • Erwin Schrodinger

    Developed Schrodinger's equation which helped predict and calculate the energy of atoms as electrons move around.
  • Israel

    US recognizes the state of Israel.
  • India

    India suffers the worst famine in 20 years; Lyndon Johnson asks for $1 billion in aid to the country.
  • President

    Richard M. Nixon is inaugurated 37th President of the US (Jan. 20).
  • Skylab

    Skylab, the first American space station, is launched (May 14).
  • Women

    US Supreme Court rules Rotary Clubs must admit women.
  • Gene Transfer

    Human gene transfer developed by Steven Rosenberg, R. Michael Blaese, and W. French Anderson
  • Texting

    Oct. 1: President Obama signs an executive order banning federal workers from texting while driving.