History of the Atom

  • Jan 1, 1000


    460 b.c., described the idea of atoms
  • Jan 1, 1000


    460 b.c., Aristotle rejected the idea of atoms
  • Jan 1, 1173

    Leaning Tower of Pisa

    Leaning Tower of Pisa
    Construction on the leaning tower of pisa began
  • Jan 1, 1337

    Hundred Year War

    Hundred Year War
    Hundred year war takes place in england
  • Jan 1, 1348

    Black Plague

    Black Plague
    Black Plague strikes Europe, kills millions
  • Jan 1, 1492

    Christopher Columbus

    Christopher Columbus
    Columbus discovers a new continent known as America
  • Jamestown

    First Europeans settle in America
  • American Revolution

    American Revolution
    American citizens begin the battle for their independence from Europe
  • Antonie Lavosier

    Created the atomic theory about the nature of matter
  • Joseph Proust

    Joseph Proust
    developed law of constant composition
  • John Dalton

    John Dalton
    performed experiments with different chemicals that showed a possibility of atoms
  • Amadeo Avogadro

    Amadeo Avogadro
    proposed his hypothesis stating that at equal volumes and temperature gases contain the same amount of molecules and or atoms
  • American Civil War

    American Civil War
    Battle between northern and southern united states takes place
  • William Crookes

    William Crookes
    discovered that cathode rays can travel in a straight line and impact a negative charge to things they strike
  • Henri Becquerel

    Henri Becquerel
    discovered that some chemicals spontaneously decompose and give off penetrating rays
  • J.J. Thomson

    J.J. Thomson
    discovered the electron and proposed a model for the structure of the atom
  • Madame Curie

    Madame Curie
    discovered radioactivity in two elements during a spontaneous decay process
  • Max Planck

    Max Planck
    showed that when you vibrate atoms enough until they glow and can only measure
  • Albert Einstein

    Albert Einstein
    Published the famous equation e=mc^2
  • Robert Millikan

    Robert Millikan
    discovered the mass and charge of an electron
  • Ernest Rutherford

    Ernest Rutherford
    thought that electrons followed an atom like the planets orbit the sun
  • Niels Bohr

    Niels Bohr
    figured that electrons can only follow the atom from a precise point
  • TItanic

    Titanic is sunk in the Pacific Ocean by massive icebergs
  • Henry Moseley

    Henry Moseley
    using x-ray tubes, discovered the charges of the nuclei of most atoms
  • Louis DeBroglie

    Louis DeBroglie
    proposed that atom particles can act like waves
  • Werner Heisenberg

    Werner Heisenberg
    described atoms by means of formula connected to the frequencies of spectral lines
  • Erwin Schrodinger

    Erwin Schrodinger
    viewed electrons as continuous clouds and introduced wave mechanics
  • James Chadwick

    James Chadwick
    Discovered the neutron
  • Twin Towers

    Twin Towers
    Both World Trade Centers in New York City are bombed by terrorists