Atomic Theory Timeline

By diego_fuentes
  • DEMOCRITUS (460 B.C.)

    DEMOCRITUS (460 B.C.)

    Used Atom name indivisible

  • ARISTOTELES

    He denied existence of atoms. Thinks matter is divisible.
  • Dalton

    Dalton

    Inventor of the atom theory.
  • J.J Thomson

    J.J Thomson

    Discovered an error in Dalton’s theory. Prove inside the atoms exists smaller particles
  • Millikan

    Millikan

    Determined the mass of an electron and confirmed that electrons have negative charges.
  • Ernest Rutherford

    Ernest Rutherford

    Discovered protons have negative charges.
  • James Chadwick

    James Chadwick

    Discovered neutrons.
  • Henry Moseley

    Henry Moseley

    Discovered that atoms contains positive charges.
  • Neils Bohr

    Neils Bohr

    Discovered the orbits per levels around the nucleus.