The development of atomic theory

  • 400


    Particle Adventure- History
    Greece. BC
    Thought that the universe consisted of empty space and an almost infinite number of particles which differ from each other in their position, form and arrangement. He called them atoms.
  • Isaac Newton

    Isaac Newton
    Particle Adventure- History
    He experimented on the law of mechanics and stated that everything moves, big or small. He also showed this mathematically.
  • John Dalton

    John Dalton
    Wikipedia- John Dalton
    Said that the atoms of different elements could be distinguished by their weight.
  • G.J. Stoney

    G.J. Stoney
    Wikipedia- George Johnstone Stoney
    Proposed that there are electrons and they conduct electricity
  • J.J. Thomson

    J.J. Thomson
    Nobel Prizes- Thomson
    He found that cathode rays could be deflected by an electric field. They have a small amount of negatively charged particles,.
  • Planck

    Wikipedia- Max PlanckGerman.
    Discovered the quantum theory also did a lot of research on heat and realised that all particles that have energy have heat.
  • Nagaoka

    Wikipedia- Hantaro Nagaoka
    Developed the structure of an atom, but was not accepted as the universal model
  • MIlikan

    Wikipedia- Robert Andrews MilikanJulian Trubin- Milikan
    Conducted an oil drop experiment, to measure electric charge. This meant balancing the gravitational force with the electric force of the tiny droplets of oil suspended between two electric rods. After a countless droplets, and a few calculations he calculated the mass of a single electron.
  • E. Rutherford

    E. Rutherford
    Answers. com - Rutherford
    New Zealand.
    He named the nucleus and proton. Also explained radioactivity as the disintergration of atoms. Made the accepted model of the structure of an atom.
  • H.G.J Moseley

    H.G.J Moseley
    Chemistry- MoseleyLibrary thinkquest- atomic development
    Studied the frequencies of x-rays given when electrons strike the positive side of a battery. Found that there was a realtionship between the x-rays and the atomic number of the metal. Realised that the atomic number was equal to the positive charge of an atom.
  • Bohr

    Wikipedia- Neils Bohr
    Bohr model of the atom shows that electrons orbit around the nucleus. Discovered that it is the electrons on the outermost shell of an atom that determines the element's characteristics.
  • James Chadwick

    James Chadwick
    Nobel Prize - Physics
    Proved the existence of neutrons. Also worked on the creation of the atomic bomb