Automic theory

  • Heisenberg
    1925 BCE

    Heisenberg

    He proposed the uncertainty principle. This principle states that one can never know the exact location and energy of an electron simmutaneously
  • Neils Bohr
    1913 BCE

    Neils Bohr

    proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level to another. The element bohrium was named after him.
  • Ernest Rutherford
    1908 BCE

    Ernest Rutherford

    He was awarded the Nobel Prize in Chemistry in 1908 "for his investigations into the disintegration of the elements, and the chemistry of radioactive substances".
  • J.J Thomson
    1897 BCE

    J.J Thomson

    Discovered the electron with the dicovery of his subatomic particle
  • Eugene goldstine
    1885 BCE

    Eugene goldstine

    He was an early investigator of discharge tubes, the discoverer of anode rays, and is sometimes credited with the discovery of the proton. Discovered positive particles. He noted that the particles had a charge equal and opposite to the electron.
  • Mendeleev
    1869 BCE

    Mendeleev

    Created the periodic table which organizes elements according to similarity
  • Dalton
    1803 BCE

    Dalton

    Believed all matter was created by atoms, which he believed where indestructible. Also that that atoms of given elements are identical in their mass and properties
  • Democritus
    460 BCE

    Democritus

    He proposed that all matter including space and time, was made up of small units named atoms.
  • Chadwick

    Chadwick

    Dicovered the Neutron. Neitrons help balance protons.