Atomic Theory

  • 400 BCE

    World event

    The Carthaginians occupy Malta
  • 400 BCE

    Democritus

    Born around 460BCE making his discovery in 400BCE praposing an idea that All items are composed of basic parts that cannot be broken down into smaller parts And later dying in 370BCE
  • World Event

    July 2nd The Union with Ireland Act
  • John Dalton and the Marble Model

    John Dalton and the Marble Model

    Born September 5th, 1766 his discovery in 1803 that the atoms of one element differ from the atoms of all other elements creating the marble model and later dying July 27th, 1844
  • Michael Faraday

    Born September 22nd, 1791 Making his discovery about the laws of electrolysis and later dying August 25th, 1867
  • Eugen Goldstein

    Born September 5th, 1850 He found some major cathode ray properties, which led to their subsequent discovery as the electron, the first subatomic particle. Later dying December 25th, 1930.
  • Ernest Rutherford

    Ernest Rutherford

    Born August 30th, 1871 he found that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus later dying October 19th, 1937. Also creating the nuclear model.
  • JJ Thomson

    JJ Thomson

    Born December 18th, 1856 he discovered that all atoms contain tiny negatively charged subatomic particles or electrons and later creating the plum pudding model later dying August 30th, 1940.
  • World Event

    The second Olympic Games, Paris 1900, open
  • Robert Millikan

    Born March 22nd, 1868 His oil drop experiment confirmed the existence of the electron and accurately determined its charge. later dying on December 19th, 1953
  • World Event

    Sinking of the Titanic
  • Neils Bohr

    Neils Bohr

    Born October 7th, 1885 realizing that the electrons did not crash into the nucleus and creating the Solar system model later dying November 18th, 1962.
  • Werner Heisenberg

    Born December 5th, 1901 his research formulating quantum mechanics in terms of matrices and discovering the uncertainty principle later dying February 1st, 1976
  • Edwin Schroedinger

    Edwin Schroedinger

    Born August 12th, 1887 Schrodinger used de Broglie's matter wave theory to develop a probabilistic model of the atom and created the electron cloud model later dying January 4th 1961
  • World Event

    The first football World Cup took place
  • James Chadwick

    James Chadwick

    Born October 20th, 1891 discovered that atoms consisted not only of protons and electrons but also neutrons creating the electron cloud model but with neutrons added and later dying July 24th 1974
  • World Event

    The British invasion of Iceland begins.

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