Atom Timeline

By 21windomke
  • 400 BCE

    Democritus

    Democritus
    Created the theory of atoms existence

  • Dalton

    Dalton
    Confirmed everything is created by atoms

  • Mendeleev

    Mendeleev
    Created the periodic table

  • Goldstein

    Goldstein
    Discovered positive particles in atoms

  • Thomson

    Thomson
    Discovered the electron

  • Rutherford

    Rutherford
    Discovered the common model of an atom

  • Millikan

    Millikan
    Discovered how to determine the charge of electrons

  • Bohr

    Bohr
    Discovered that electrons orbited nuclei in atoms

  • Planck

    Planck
    Created the quantum theory

  • Heisenberg

    Heisenberg
    Created the Uncertainty Principle:
    -You can never know the exact location of an electron
    -You can never know the exact amount of energy it produces

  • Chadwick

    Chadwick
    Discovered neutrons in an atom

  • Schrodinger

    Schrodinger
    Created an equation for tracking electron movements