Atomic Model/Theory Timeline

By DIXONNIC000

  • 1939: World War II begins

  • 1945: World War II ends

  • 2011: 9.0 magnitude earthquake strikes Japan near capital

  • 1926: Schrödinger figures out a wave equation that explains the energy levels of atoms

  • 1932: Chadwick discovers the neutron

  • 776 BCE: Olympic Games begin

  • 495-435 BCE: Empedocles publishes "On Nature"

    "On Nature" states that all matter is made up of earth, air, fire, and water.

  • 5th century BCE and 460-370 BCE: Leucippus and Democritus form the theory that everything is made up of two things, atoms and empty space

  • 429-347 BCE: Plato publishes "The Republic"

    "The Republic" explores how a good life is lived, which type of government would be most ideal, and what constitutes a just human being.

  • 384-322 BCE: Aristotle classifies species into "blooded" and "non blooded" groups

    These two groups are quite accurate to present day's "vertebrates" and "invertebrates" categories.

  • 30-33 AD: Jesus Christ is crucified

  • 1766-1844: Dalton discovers that the ratios of compounds are fixed

  • 1856-1940: Thomson discovers the electron

  • 1871-1937: Rutherford discovers that atoms have positive nuclei

  • 1900: Planck publishes his finding that a frequency resonator's energy is constant

  • 1910: Millikan discovers that electrons have a constant negative charge

  • 1913: Bohr creates an orbital model for an atom

  • 1924: Louis de Broglie publishes his findings thesis "Recherches sur la Théorie des Quanta"

    "Recherches sur la Théorie des Quanta" is about wave mechanics.

  • 1925: Heisenberg provides the basis for quantum mechanics