Structures and properties of elements over time

Timeline created by ekarsli
  • Hennig Brand discovered Phosphrous.

    This was the first scientific discovery of an element.
  • A mechanical universe with small solid

    masses in motion was proposed by Isaac Newton.
  • John Dalton Proposes an "atomic theory".

    His theory is about spherical solid atoms based upon measurable properties of mass.
  • Johann Dobereiner Proposed something.

    He proposed that nature contained triads of elements the middle element had properties that were an average of the other two members when ordered by the atomic weight.
  • Johann Dobereiner discovered the halogen triad.

    it consisted of Chlorine, Bromine and Iodine.
  • Michael Faraday studied electricity

    He studied the effect of electricity on solution and "electrolysis". he developed the law of electrolysis.
  • J.Plucker

    He built the first discharge gas tube.
  • Loather Meyer

    He classified elements into six families by their valance
  • Dimitri Mendeleev

    He arranged elements into seven groups with similar properties. He discovered the properties of elements known as the periodic law.
  • James Clerk Maxwell

    He proposed electric and magnetic fields filled the void
  • Sir William Crookes

    Discovered cathode rays
  • E.Goldstein

    He studied "Canal Rays"
  • G.J.Stoney

    He proposed that electricity was made out of negative energy and called it electrons.
  • Wilhelm Roentgen

    He experimented and eventually found "x-rays"
  • Henri Becquerel

    he discovered some chemicals spontaneously decompose and give off very pentrating rays.
  • Rutherford

    Figured out mass was concentrated in the nucleus.
  • J.J.Thomson

    He discovered the size of an atom and that canal rays are associated with proton H+