Epic Atomic Theory

  • 442

    Democritis

    A Greek plilosopher originated the though that matter is composed of invisible elements
  • Period: to

    Epic Atomic Theory

  • John Dalton

    John developed a theory that all matter is composed of different atoms of different weights and is combined in ratios by weight. He also said atoms are spherical and in motion.
  • Pierre and Marie Currie

    Theorized that radioactive particles cause atoms to break down
  • JJ Thompson

    JJ discovered electrons using properties of cathode rays
  • Max Planck

    Stated that electromagnetic energy could only be emitted in quantized form. (His quanta is now called photons)
  • Hantaro Nagaoka

    Suggests that the atom has acentral nucleus
  • Robert Milikan

    Robert measured the charge of a single electron
  • Ernest Rutherford

    Developed a theory for the structure of an atom, he used a gold foil experiment to help him look at the scattering of alhpa particles, he was the first to demonstrate the atomic nucleus existence
  • Neils Bohr

    Neil developed the Bohr atomic model which stated that electrons are trveling in orbit around the nucleus
  • Luis De Brogive

    Proposes that moving particles like electrons, have some properties of waves
  • Erwin Shrodinger

    He described how electrons move in a wave form
  • Heisenberg

    described atoms by means of formula connected to frequencies of spectrical lines
  • Paul Dirac

    Proposed Anti-particles
  • James Chadwick

    Discovers the nuetron component of the atomic nucleus
  • Mann

    Processes the Quark model and describes elementary particles that have no substructure