History of Atomic Structure by Lisa G

Timeline created by ossyria
  • 460

    Democritus

    Contributed the theory that everything is made up of atoms that move around constantly.
  • Period:
    460
    to

    History of Atomic Structure

  • Isaac Newton

    Proposed that all atoms were held together by attractions we now call ‘forces.’
  • John Dalton

    One of the pioneers in founding modern atomic theory.
  • G.J.Stoney

    Introduced the term ‘electron’ as the fundamental unit quantity of electricity.
  • J.J.Thompson

    Discovered electrons and isotopes.
  • Max Planck

    Founded quantum theory, a theory describing the interactions of elementary particles or energy states.
  • H. Nagaoka

    Established our basic image of atom- rings of electrons orbiting a positively charged nucleus.
  • E. Rutherford

    He established that the nucleus was: very dense, very small and positively charged by probing alpha particles in a piece of thin gold foil. He also assumed that the electrons were located outside the nucleus.
  • H.G.J.Moseley

    Arranged the periodic table by atomic numbers and discovered that the atomic number of an element is equal to the number of protons in the nucleus. He also determined the charges on the nuclei of most atoms using x-ray tubes.
  • Niels Bohr

    Created a liquid drop model of the atomic nucleus.
  • James Chadwick

    Discovered the neutron.