History of the Atom - John Etringer

By johnetringer
  • Jan 1, 1000

    Democritus

    Democritus
    Credited with creating the first atomic theory. - 400 BC
  • Jan 1, 1000

    Aristotle

    Aristotle
    Asserted that a substance is a combination of matter and form. - 350 BC

  • Antoine Lavoisier

    Antoine Lavoisier
    "Father of modern chemistry" Found and named hydrogen and oxygen.

  • Joseph Proust

    Joseph Proust
    Discovered the Law of Definite Proportions.

  • John Dalton

    John Dalton
    Created the first modern atomic theory.

  • Amadeo Avogadro

    Amadeo Avogadro
    Avagadro's theory, “relative molecular mass of a gas can be calculated from the mass of sample of known volume.”

  • First Steam Locomotive

    First Steam Locomotive
    George Stephenson designs the first steam locomotive.

  • Braille Invented

    Braille Invented
    Louis Braille invents braille printing for the blind.

  • Invention of Morse Code

    Invention of Morse Code
    Samuel Morse invents the telegraph and Morse Code.

  • First Telephone

    First Telephone
    Alexander Graham Bell patents the telephone.

  • AC electrical supply invented

    AC electrical supply invented
    NIkola Tesla develops the alternating current electrical supply system.

  • William Crookes

    William Crookes
    Pioneer of vacuum tubes, one of the first scientists to study plasma.

  • J. J. Thopson

    J. J. Thopson
    Discovered both electrons and isotopes.

  • McKinley Assassinated

    McKinley Assassinated
    U.S. President William McKinley assassinated.

  • Henri Becquerel

    Henri Becquerel
    Contributed to the discovery of radioactivity.

  • Marie Curie

    Marie Curie
    Discovered polonium and radium, contributed to the discovery of radioactivity.

  • First Silent Movie

    First Silent Movie
    The Great Train Robbery premiers.

  • First Airplane

    First Airplane
    The Wright brothers invent the first gas motored and manned airplane.

  • Max Planck

    Max Planck
    Created the Quantum Theory.

  • Robert Millikan

    Robert Millikan
    Measured the charge of electrons.

  • Henry Moseley

    Henry Moseley
    Justified the concept of an atomic number.

  • Ernest Rutherford

    Ernest Rutherford
    Discovered half-lives, created the Rutherford atomic model, split the atom.

  • Prohibition Begins

    Prohibition Begins
    Alcohol prohibition begins in the United States.

  • Albert Einstein

    Albert Einstein
    Developed the theory of general relativity. Contributed to the particle theory and motion of molecules.

  • Niels Bohr

    Niels Bohr
    Published atomic model closely related to today's,

  • Louis de Brogile

    Louis de Brogile
    Created the theory of electron waves, and wave-particle duality.

  • Werner Heisenberg

    Werner Heisenberg
    Asserted the uncertainty principle, created quantum mechaincs.

  • Erwin Schrodinger

    Erwin Schrodinger
    Created an equation of the change of quantum states, and the Schrodinger's Cat thought experiment.

  • Black Thurday

    Black Thurday
    Stock market crash, marked the beginning of the great depression.

  • James Chadwick

    James Chadwick
    Credited with discovering neutrons.