Atomic Theory Timeline

  • Antoine Lavoisier

    Antoine Lavoisier
    He burnt phosphorus and sulfur, and proved that the products had the same mass. Thus he established the Law of Conservation of Mass.
  • J. L. Proust

    J. L. Proust
    iDsproved Berthollet with the law of definite proportions, which is sometimes also known as Prousts Law.
  • Thomas Young

    Thomas Young
    He discovered that when a beam of light is seperated into two beams and then reunited, it created a pattern of light and dark.
  • John Dalton

    John Dalton
    the total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space. This principle officially came to be known as Dalton's Law of Partial Pressures n 1803. Dalton also introduced the belief that atoms of different elements could be distinguished by their atomic weights.
  • Max Planck

    Max Planck
    He developed the Quantum theory. He tried to make conclusions from the heat radiation to the radiating atom. The discovery of quanta changed the idea of physics, because it showed that ideas about the nature of radiation and energy were wrong. The Nobel Prize in Physics 1918 was awarded to Max Planck "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta".
  • Heinrich Hertz

    Heinrich Hertz
    Discovered the photoelectric effect.In the photoelectric effect, electrons are emitted from matter in short wavelenghtd. These are called photoelectrons.
  • Ernest Marsden

    Ernest Marsden
    Ernest Marsden worked on the structure of the atom. Marsden did this by observing that a tiny fraction of alpha particles fired at a thin gold foil were deflected straight back.
  • J.J. Thompson

    J.J. Thompson
    he discovered electron and how much they weighed using the CRT. He Nobel Prize of physics for it in 1906.
  • Marie and Pierre Curie

    Marie and Pierre Curie
    Isolated a new element that came to be called “radium.” They won a Nobel Prize in Chemistry in 1903.
  • Albert Einstein

    Albert Einstein
    Mathematically proved the existence of atoms.Einstein also in 1905 proposed that light energy can be absorbed or emitted only in discrete packets called quantaand this led to Einstein’s winning of the Nobel Prize. Einstein in 1905 also explained the equivalency of mass and energy (e=mc^2)
  • Hans Geiger

    Hans Geiger
    Developed an electrical device to click when hit with alpha particles.
  • Ernest Rutherford

    Ernest Rutherford
    He presented the atomic model with a dense neucleous and outside electrons.
  • Neils Bohr

    Neils Bohr
    he completed his theory of atomic structure. This atomic theory was a combination of Rutherford’s work and ideas of the atom, with Planck’s Quantum Theory. He also made a simple ( though innacurate) model of hydrogen. Won the Nobel Prize inChemistry in 1922
  • Arthur Compton

    Arthur Compton
    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 is now known as the Compton effect,
  • Louis de Broglie

     Louis de Broglie
    French quantum physicist Louis de Broglie introduced his theory of particle-wave duality. He won the Nobel for Physics in !929.
  • Wolfgang Pauli

    Wolfgang Pauli
    Mostly known for his 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. Won the Nobel Prize in 1945.
  • Erwin Schrödinger

    Erwin Schrödinger
    He developed a way to both mathematicall and visually display wave patterns in electrons. Surpassed Bohr's model.
  • Werner Heisenberg

    Werner Heisenberg
    The Uncertainty Principle states the more precisely the position of a particle is determined, the less precisely the momentum is known in this instant, and vice versa. Won the Nobel Prize for Physics in 1932
  • Paul Dirac

    Paul Dirac
    He created a relativistic equation of motion for the wave function of the electron. He shared the 1933 Nobel Prize in Physics for 1933 with Erwin Schrödinger
  • James Chadwick

    James Chadwick
    proofs the existence of the neutron which accelerated the research in nuclear physics inmensely. He won the Nobel Prize in 1935 for physics.
  • Carl Anderson

    Carl Anderson
    Took a picture that clearly displayed a positron crossing a lead plate placed in the cloud chamber. Won a Nobel Prize in 1936.
  • Enrico Fermi

    Enrico Fermi
    He discovered that a newly-discovered neutron decaying to a proton emits an electron and a particle which he called a neutrino. Enrico Fermi received the Nobel Prize in 1938 for "his discovery of new radioactive elements produced by neutron irradiation.
  • Irene Joliet-Curie

    Irene Joliet-Curie
    researched the action of neutrons. Won the nobel prize in 1935
  • Otto Frisch

    Otto Frisch
    Works on discovering nuclear fission with his aunt.
  • Otto Hahn, Fritz Strassman, Lise Meitner

    Otto Hahn, Fritz Strassman, Lise Meitner
    produced Uranium nuclear fission. Otto Hahn won a Nobel Prize in 1944.
  • Richard Feynman and Julian Schwinger

    Richard Feynman and Julian Schwinger
    They developed the theory called quantum electrodynamics.
  • murray gell-mann and george zweig

    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 still smaller particles. The Nobel Prize in Physics 1965 was awarded jointly to Julian Schwinger and Richard P. Feynman "for their fundamental work in quantum electrodynamics, with deep-ploughing consequences for the physics of elementary particles".