Atomic Theory Timeline

  • Antoine Lavoisier

    Burnt phosphorous and sulfur and proved that the mass was the same as before, bringing about the Law of Conservation of Mass.
  • J.L. Proust

    Proust’s greatest accomplishment was disproving Berthollet with the law of definite proportions, also known as Prousts Law.
  • Young's Wave theory of light

    Young's Wave theory of light
    Young discovered that when a single beam of light was seperated,and then reunited, the beams created a certain light-dark pattern. This was becasue of complimenting and canceling wavelenghts.
  • John Dalton

    John Dalton
    The total pressure of a mixture of gases awas equal to the sum of the partial pressures that each individual gas exerted while occupying the same space.This scientific law became known as Dalton's Law of Partial Pressures in 1803
  • Dalton writes A New System of Chemical Philosophy

    Dalton writes A New System of Chemical Philosophy
    In A New System of Chemical Philosophy, Dalton showed that atoms of different elements could be distinguished by their atomic weights
  • Max Planck

    Max Planck
    developed Quantum theory, tried to make conclusions from radiation of heat to the radiation of an atom and discovered quanta. Debunked all previous thoughts of radiation and energy.
  • Heinrich Hertz

    Heinrich Hertz
    Discovered the photoelectric effect.In the photoelectric effect, electrons are emitted from matter as a consequence of their absorption of energy from electromagnetic radiation, such as visible or ultraviolet light. Electrons emitted in this manner may be referred to as photoelectrons.
  • Ernest Marsden

    Ernest Marsden
    worked with Rutherford on the gold foil test. Fired atomic particles at the foil and whatched them bounce back.
  • J.J. Thomson

    J.J. Thomson
    Used a cathode ray tube (CRT) to determine the electron-mass ratio.
  • Thomson's electron

    Thomson's electron
    Using the CRT, Thomson discovered that there were negatively charged particles orbiting around every nucleus
  • Marie and Piere Curie

    Marie and Piere Curie
    these to scientist isolate a substance they called "radium". The discovery of a new element is a milestone in scientific history.
  • Marie and Piere win a Nobel Prize

    Marie and Piere win a Nobel Prize
  • Albert Einstein

    Albert Einstein
    Einstein Created the General Theory of relativity. He also figure that light energy can be absorbed or emitted only in discrete packets called quanta. Einsted proposed the equivalence of energy and mass with his famous equaition: e=mc^2. Also mathematically iproved the existence of atoms.
  • Thomson recieves Nobel prize

    Thomson recieves Nobel prize
    The Nobel Prize in Physics was awarded to J.J. Thomson "in recognition of the great merits of his theoretical and experimental investigations on the conduction of electricity by gases".
  • Heins Geiger

    Heins Geiger
    developed the geiger counter, which ticked when it hit alpha particles.
  • Ernest Rutherford Nobel

    Ernest Rutherford Nobel
    The Nobel Prize in Chemistry 1908 was awarded to Ernest Rutherford "for his investigations into the disintegration of the elements, and the chemistry of radioactive substances".
  • Ernest Rutherford's atomic probe

    Ernest Rutherford's atomic probe
    used thin gold foil to find that the nucleus is densly packed. also assumed that the electrins were on the outside.
  • Bohr's model

    Bohr's model
    Neils Bohr developed a simplistic, yet innacurate model for an atom.
  • Planck's Prize

    Planck's Prize
    The Nobel Prize in Physicswas awarded to Max Planck "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta".
  • Aurther Compton Effect

    Aurther Compton Effect
    to his discovery of the increase of wavelength of X-rays due to scattering of the incident radiation by free electrons, which implies that the scattered quanta have less energy than the quanta of the original beam. This effect isknown as the Compton effect,
  • Louis de Broglie

    Louis de Broglie
    French, Louis de Broglie introduced his theory of particle-wave duality in 1924
  • Wolfgang Pauli

    Wolfgang Pauli
    Wolfgang Pauli is wll know for the Pauli Exclusion Principle which states that no two electrons in an atom can have the same four quantum numbers. This allows scientist to give electrons an “address” to further distinguish themselves from others in the same atom.
  • Schrödinger's wave-pattern equation

    Schrödinger's wave-pattern equation
    Schrödinger developed a way to mathematically and visually display the wave patterns of electrons. Surpassed Bohr's model.
  • Werner Heisenberg

    Werner Heisenberg
    says the less precisely the momentum is known, the more precissely the atom was placed.
  • Compton's pize

    Compton's pize
    Compton wins a Nobel Prize "for his discovery of the effect named after him"
  • Paul Dirac Equation

    Paul Dirac Equation
    equation for the motion of the wave of an electron.
  • Lois De Broglie won the Nobel Prize

    Lois De Broglie won the Nobel Prize
    Received the Nobel Prize on his wave nature of electrons discover.
  • James Chadwick

    James Chadwick
    Poves existence of the neutron. Is what accelerated the research in nuclear physics greatly.
  • Heisenburg

    The Nobel Prize in Physics was awarded to Werner Heisenberg "for the creation of quantum mechanics, the application of which has, inter alia, led to the discovery of the allotropic forms of hydrogen".
  • Carl Anderson

    Carl Anderson
    Anderson took a clear shot of a positron shifting through a lead plat in the cloud chamber.
  • Schrödinger

    The Nobel Prize in Physics was awarded to Erwin Schrödinger "for the discovery of new productive forms of atomic theory"
  • Paul Dirac wins Nobel

    Paul Dirac wins Nobel
    The Nobel Prize was awarded to Erwin Schrödinger and Paul Adrien Maurice Dirac "for the discovery of new productive forms of atomic theory"
  • enrico Fermi

    enrico Fermi
    neutrons are decaying to a proton and emits an electron and a particle which he called a "neutrino"
  • James Chadwick gets Nobel

    James Chadwick gets Nobel
    The Nobel Prize was awarded to James Chadwick "for the discovery of the neutron".
  • Irene Joliot-curie wins Nobel

    Irene Joliot-curie wins Nobel
    The Nobel Prize was awarded to Irène Joliot-Curie "in recognition of her synthesis of new radioactive elements"
  • Carl Anderson

    Carl Anderson
    The Nobel Prize was awarded to Carl David Anderson "for his discovery of the positron".
  • Enrico Fermi's Nobel

    Enrico Fermi's Nobel
    Enrico Fermi received the Nobel Prize for "his discovery of new radioactive elements produced by neutron irradiation"
  • Irene

    reasearched the action of neutrons
  • Otto Frisch

    Otto Frisch
    Otto Frisch works toward reaching nuclear fission.
  • Otto Hahn, Fritz Strassman, Lise Meitner

    Otto Hahn, Fritz Strassman, Lise Meitner
    produced Uranium nuclear fission
  • Enricp Fermi

    Enricp Fermi
    created controlled nuclear fission
  • Frish

    Figured out the correct way to produce Litlle Boy.
  • Wolfgang Pauli recieves Nobel

    Wolfgang Pauli recieves Nobel
    The Nobel Prize was awarded to Wolfgang Pauli "for the discovery of the Exclusion Principle, also called the Pauli Principle".
  • Quantum Electrodynamics

    Quantum Electrodynamics
    The theory called quantum electrodynamics, developed from work by Richard Feynman and Julian Schwinger.
  • Broglie, Lab

    Broglie, Lab
    Broglie became the first prestigious scientist to call for a multi-national laboratory
  • Carl Anderson Mesotron

    Carl Anderson Mesotron
    discovered cosmic radiation with a mass of about 200 electron masses, one-tenth of a proton, that is called a mesotron.
  • the Quark

    the Quark
    murray gell-mann and george zweig theorized that the differences between protons, neutrons, and newly discovered particles could be explained by the existence of these even smaller particles.