Atomic Model

Timeline created by rasta16
  • Dalton Model

    Dalton Model
    1803 JOHN DALTON PICTURES ATOMS AS TINY, INDESTRUCTIBLE PARTICLES, WITH NO INTERNAL STRUCTURE.
  • Thomson Model

    Thomson Model
    1897 J.J. Thomson, a British scientist, discovers the electron. The later leads to his “plum-pudding” model. He pictures electrons embedded in a sphere of positive electrical charge.
  • Hantaro Nagaoka

    Hantaro Nagaoka
    1904 Hantaro Nagaoka, a Japanese physicist, suggests that an atom has a central nucleus. Electrons move in orbits like the ring around Saturn.
  • Rutherford Model

    Rutherford Model
    1911 New Zealand physicist Ernest Rutherford finds that an atom has a small, dense positively charged nucleus. Electrons move around the nucleus.
  • Bohr's Model

    Bohr's Model
    1913 In Niels Bohr’s model, the electrons move in a circular orbit at fixed distance from the nucleus.
  • Louia de broglie

    Louia de broglie
    1923 French physicist Louis de Broglie proposes that moving particles like electrons have some properties of waves. Within a few years, experimental evidence supports the idea.
  • Electron Cloud Model

    Electron Cloud Model
    1926 Erwin Schrodinger develops mathematical equations to describe the motion of electrons in atoms. His work leads to the electron cloud model.
  • James Chadwick

    James Chadwick
    1932 James Chadwick an English physicist, confirms the existence of neutrons, which have no charge. Atomic nuclei contain neutrons and positively charged protons.