Atom

History of the Atom

By jiogrammaton
  • 400

    First Theory (BC)

    First Theory (BC)
    Democritus is the first man to theorize that everything is made up of atoms.

  • Atomic Theory

    Atomic Theory
    John Dalton brings back the atomic theory.

  • Crooke's Tube

    Crooke's Tube
    A famous experiment is performed by Crooke. He discovered that cathode rays travel in straight lines and omit heat when they hit certain materials.

  • Radioactivity is Discovered

    Radioactivity is Discovered
    Becquerel discovers radioactivity when working with Uranium.

  • Plum Pudding Model

    Plum Pudding Model
    J.J Thomson discovers electrons and invents the Plum Pudding Model of an atom.

  • Gold Foil Experiment

    Gold Foil Experiment
    Ernest Rutherford's gold foil experiment showed that there is a nucleus inside of an atom, containing a positive charge. All the mass of the atom is found within the nucleus.

  • Neutrons are Discovered

    Neutrons are Discovered
    Discovered by James Chadwick, neutrons are neutral atoms found within the nucleus. He bombarded the alpha rays on Beryilium and came to discover neutrons.