Atom

The Atom Timeline

  • Dalton: Solid Model Sphere

    Dalton: Solid Model Sphere
    The Solid Sphere Model was the very first atomic model and was developed by John Dalton in the early 19th century.
  • Thompson: Plum Pudding Model

    Thompson: Plum Pudding Model
    In Thomson's model, the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged "plums" surrounded by positively charged "pudding".
  • Rutherford: The nuclear model

    Rutherford: The nuclear model
    Rutherford designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure
  • Bohr: The Bohr (Planetary) Model

    Bohr: The Bohr (Planetary) Model
    The Bohr model depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus, much like our solar system.
  • Schrodinger: Quantum Mechanics Model

    Schrodinger: Quantum Mechanics Model
    Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position, which treats electrons as matter waves.
  • Proof of work

    Proof of work
    As directed