Timeline of the Atom

  • Period: 322 to 384


    Aristotle-384-322 BC---Aristotle provided us with knowledge of natural science including Physics, which gives a vast amount of information on astronomy, meteorology, plants, and animals.
  • 442


    Democritus-442 BC---Greek philosopher, who developed the atomic theory of the universe,His atomic theory anticipated the modern principles of the conservation of energy and the irreducibility of matter.
  • Period: 500 to


    AlChemists-500BC-1720--- develop the theory—that all metals are composed of mercury and sulfur and that it is possible to change base metals into gold
  • Robert Boyles

    one of the founder of moderne chemisrty
  • Joseph Protust

    had the minieral named after him inhis honor
  • Period: to

    Amedeo Avogardo

    made amedeao law and stated about gases density
  • Lavoisier

    Lavoisier-1777---French chemist, who is considered the founder of modern chemistry. Lavoisier clarified the concept of an element as a simple substance that could not be broken down by any known method of chemical analysis, and he devised a theory of the formation of chemical compounds from elements.
  • Jöns Jacob Berzelius

    created chemistry chemical notaion formula
  • Coulomb

    Coulomb-1780's---He explianed that like fluids repelled and unlike attracted,this was important in the development of the theory of absolute measurement, and had a great impact on electrical potential.
  • Period: to

    Michael Faraday

    Faraday was specifically involved in the study of chlorine. He discovered two new compounds of chlorine and carbon. Plus he invented the bunsun burner.
  • Becquerel

    Becquerel-1896---Wilhelm Röntgen discovered X rays by observing the fluorescence they produced.
  • J.J. Thompson

    J.J. Thomson-1898---J.J Thompson was the first to discover the electron.
  • Marie Curie

    he Curies-1898---Pierre Curie and his wife Marie Curie stated that radioactive materials cause atoms to break down spontaneously, releasing radiation in the form of energy and subatomic particles.
  • Max Planck

    Max Planck-1900---In 1900 Planck stated that energy is radiated in small, discrete units, which he called quanta
  • Werner Hiesenberg

    created quantom mechanics
  • John Dalton

    John Dalton-1803---British chemist and physicist, who developed the atomic theory upon which modern physical science is founded.Dalton's most important contribution to science was his theory that matter is composed of atoms of differing weights and combine in simple ratios by weight.
  • Albert Einstein

    Albert Einstein-1905---Einstein was known as the creator of the special and general theories of relativity and for his intelligent hypothesis concerning the particle nature of light.
  • Period: to

    Robert Millikan

    Robert Millikan-1908-1917---American physicist, best known for his work in atomic physics and major science, dealing with the fundamental constituents of the universe, the forces they exert on one another, and the results produced by these forces.
  • Period: to

    Earnest Rutherford

    Ernest Rutherford-1909-1911---British physicist, who became a Nobel laureate for his pioneering work in nuclear physics and for his theory of the structure of the atom
  • Neils Bohr

    Neils Bohr-1913---Bohr made numerous contributions to our understanding of atomic structure and quantum mechanics.
  • Geiger

    Geiger-1925-----Geiger was the first scientist to explain DNA.
  • Erwin Schroedinger

    Erwin Schroedinger-1926---Schroedinger explained movement of an electron in an atom as a wave.
  • Otto Hahn &Lise Meitner

    Otto Hahn-1938---German physical chemist and Nobel laureate, best known for his contributions in the field of radioactivity.
    Lise Meitner-1938---Austrian-Swedish physicist, who first identified nuclear fission.
  • Murry Gell

    Murry Gell-1964---United States physicist, noted for his classification of subatomic particles and his proposal of the existence of quarks.
  • Credits