Chemistry Timeline

  • 100


    Date: 460-370 B.C.
    Suggested that atoms are indivisable and indestructable.
  • 100


    Date: 492 BCE-432 BCE
    Empedocles believed that all matter was made up of only four elements: earth, water, air, and fire.
  • 100


    Date: 440 BC
    Leucippus helped Democritus create the atomic theory.
  • 100


    Date: 427 BC-347 BC
    Plato said that each of the four supposed elements (earth, wind, fire, water) were made of 3D shaped specific to each element.
  • 100


    Date: 384 BC-322 BC
    Aristotle believed in the four basic elements and he said that there were also four characteristics that went with the elements. There was hotness, dryness, wetness, and coldness.
  • 100


    a volcanoe blew up near a city which was completely covered in ash and bodies are seen today in surreal stauelike poses in the year of 79 a.d.
  • Oct 1, 1348

    Black plague

    1348-1350 the black plague wipes out much of the europian population
  • U.S. established

    The U.S. gained it's independance from britain.
  • John Dalton

    John Dalton pictures atams as tiny indestructible partical, with no internal structure.
  • Planck

    Planck came up with quantum action
  • Millikan

    Millikan found out what the charge is on an electron.
  • J.J. Thompson

    Discovered the electron and made the PlumPudding model.
  • Heisenberg

    Heisenberg discovered how electrons move
  • Rutherfod

    Found that the atom has a possitivly charged nucleus and electrons that float around it.
  • Bohr

    Made model where electrons move in a circular motion around the nucleus at a fixed distance.
  • Louis de Broglie

    Louis started playing with the idea of matter as waves
  • Schrodinger

    Schrodinger developed the latest atomic model for wer the electrons will likely be found
  • Chadwick

    Confermed the existanse of neutron and that they were negativly charged, and proved that the nucleus contained protons and neutrons.
  • WW2

    Date: 1939-1945
    A war between the allies and the axis.
  • 9/11

    Al Qaeda members crash planes into the World Trade Center and pentagon.