The Atom Timeline

  • Period: to

    Dalton: Solid Sphere Model

    The Solid Sphere Model was the first atomic model and was developed by John Dalton in the early 19th century. He came up with his theory as a result of his research into gases.
  • Thompson: The Plum Pudding Model

    The Plum Pudding Model is a model of atomic structure proposed by J.J. Thompson in the late 19th century. Thompson discovered that atoms are composite objects.
  • Rutherford: The Nuclear Model

    Rutherford overturned Thompson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.
  • Bohr: The Bohr (Planetary) Model

  • Schrodinger: Quantum Mechanics Model

    In 1926 Erwin Schrödinger, an Austrian physicist, took the Bohr atom model one step further. Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position.