Atomic Theory Timeline

Timeline created by trichy
  • 384

    Aristotle

    He was not able to see how atoms could stay in perpetual motion and he developed a theory based upon the four elements. He claimed Aristotle’s theory made a great generalization off all matter being made of the four elements: fire, water, earth, and air.
  • 460

    Democritus

    The Democritus Atomic Theory revolves around the atoms that are present in the atmosphere.
  • Period: 460 to

    Atomic Theory Project

  • Dalton

    Democritus was a Greek philosopher, and therefore, never backed up any ideas with experimentation. Dalton's approach to science involved experimentation and measurements and the attempt at explaining what he observed
  • Thomson

    He discovered the electron in an atom while studying "cathode rays".
  • Rutherford

    Rutherford was a scientist who discovered established the nuclear structure of the atom and the essential and nucleus.ature of radioactive decay as a nuclear process.
  • James Chadwick

    James Chadwick proved the existence of the neutron in 1932 which is what accelerated the research in nuclear physics greatly.
  • de Brogile

    Among other things he postulated that all particles have a wave nature.
  • Electron model was invented

    The electron cloud model was invented throughout the 20th century. (1900's) Yet after neils bohrs model in 1913
  • Bohr

    Bohr's theory of the atom and its quantum structure.
    The theory of complementarity, which helps explain wave/particle duality