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.