History of the atom

By LewisGS
  • 460

    Democritus

    Democritus
    Formulated the atomic theory of the universe. Alive in 460 B.C.

  • John Dalton

    John Dalton
    Developed of of Democritus's theories, Dalton devloped his own atomic theory which is still validated today.

  • J. J. Thompson

    J. J. Thompson
    Discovered that cathode rays were composed o f a previously unknown negatively charged particle. He discovered the electron, and was the first to find a subatomic particle.

  • Earnest Rutherford

    Earnest Rutherford
    DIscovered the concept of radioctive half-life.

  • Neils Bohr

    Neils Bohr
    Bohr developed the Bohr model of the atom, in which he 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 (or orbit) to another.