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Atomic Theory

By Jean M. Morales
  • 460 BCE

    DEMOCRITUS

    DEMOCRITUS
    Devised a theory which stated that atoms are indivisible.
  • 384 BCE

    ARISTOTLES

    ARISTOTLES
    Proposed that the atom didn't exist and was against Democritus postulate.

  • JOHN DALTON

    JOHN DALTON
    Proposed an atomic theory stating that elements combine in specific proportions.

  • J.J. THOMSON

    J.J. THOMSON
    Proved there are particles inside atoms and they are divisble with a Cathode ray tube.

  • ROBERT MILLIKAN

    ROBERT MILLIKAN
    Credited with finding electrons in atoms and studying their composition.

  • ERNEST RUTHERFORD

    ERNEST RUTHERFORD
    Credited with finding out the structure of an atom.

  • HENRY MOSELEY

    HENRY MOSELEY
    Contributed by finding out about the atomic number.

  • NIELS BOHR

    NIELS BOHR
    Discovered electron orbits and made modern used atomic model.

  • WERNER HEISENBERG

    WERNER HEISENBERG
    Made crucial contributions to quantum mechanics.

  • ERWIN SCHRÖDINGER

    ERWIN SCHRÖDINGER
    Contributed with the Electron Cloud Model.

  • JAMES CHADWICK

    JAMES CHADWICK
    Found neutrons in the atom.