Atomic Theory

  • 270


    (BC) adopted the atomism of Leucippus and Democritus, maintaining that all objects and events—including human lives—are in reality nothing more than physical interactions among minute indestructible particles. As they fall toward the center of the earth, atoms swerve from their paths to collide with each other and form temporary compound beings.
  • 300

    Wheel Of Fortune

    3000 BC
    the wheel was invented
  • 370


    (BC) Formulated an atomic theory for the cosmos. Same theorys as Leucippus.
  • 475


    (BC) First greek to develop the theory of atomism, the idea that everything is composed entirely of various Imperishable, indivisable elements called atoms
  • Isaac Newton

    Isaac Newton
    Proposed a mechanical universe with small solid masses in motion
  • the greatest political event

    union of the governments of england and scottland under the tittle of great britain
  • Henry Cavendish

    Discovery of hydrogen or what he called "inflammable air". He described the density of inflammable air, which formed water on combustion
  • Lavoisier

    Recognized and named oxygen (1778) and hydrogen (1783), abolished the phlogiston theory, helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature.
  • massacre

    the boston massacre. adams decide to defend the british soliders involved in the atack.
  • french revolution

    french revolution babyy
  • french revolution

    revolution baby, storming of the bastille
  • John Dalton

    Propsed on "atomic theory" with spherical solid atoms based upon measurable properties of mass.
  • independence

    haiti declares its independance and becomes the second independent state in the western hemisphere
  • Michael Faraday

    Studied the effect of electricity on solutions, coined term electrolysis, as a splitting of molecules with electricty, develpoed
  • battle field

    the battle of bunker hill was intense
  • J. Plucker

    Built one of the first gas discharge tubes (Cathode Ray Tube).
  • Dmitri Mendeleev

    Arranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of their atomic weights". This became know as periodic law.
  • James Clerk Maxwell

    Propsed electrical magnetic feilds filled the void
  • Sir William Cookes

    Discovered cathode rays had the following properties. Travel in straight lines from the Cathode, cause glass to fluoresce, impart a negitive charge to objects they strike. Are deflected by electric feilds and magnets to suggest a negative charge, cause pinwheels in their path to spin indicating they have mass.
  • E, Goldstein

    Used a CRT to study "Canal Rays" which had electrical and magnetic properties opposite of an electron.
  • G.J. Stoney

    Proposed that electricity was made of discrete negative particles he called electrons.
  • Max Planck

    Used the idea of Quata Coliscrete (units of energy) to explain hot glowing matter.
  • Abegg

    Doscovered that inert gases had a stable electron configuration which lead to their chemical inactivity.
  • Hans Geiger

    Developed an electrical device to "click" when hit with alpha particles.
  • R.A. Millikan

    Oil Drop experiment determined charge (e=1.603x10*-19coulomb) and the mass (m=9.11x10*-19 gram) of an electron.
  • world war one start

  • NACA is started

  • Niels Bohr

    Model of the atom, that explains the emission and absorption of radiation as transitions between stationary electronic states in which the electron orbits the nucleus at a definite distance.
  • Schrodinger

    Veiwed electrons as eontinuos clouds and introducing "wave mechanics" as a mathmatical model of the atom.
  • Paul Dirac

    Proposed anti-particles. Anderson discovered the Anti-Electron
  • James chadwick

    using alpha particles, discovered a neutral atomic particle with a mass close to a proton, Thus was discovered the Neutron.
  • Lise Meitner

    Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction.
  • world war two starts

  • Enrico Fermi

    Conducted the first controlled cjain reaction releasing energy from the atoms nucleus.
  • the first computer was invented

  • PlayBoy

    Playboy was invented
  • Mr. Perry

    great scientist is born.
  • first laptop "osborne 1"

  • Period: to

    Atomic theory

  • olympic games

    it was a bunch of events
  • redsox win world series

  • Roma

    Roman empire crashed