Atomic theory time line

By aee33
  • 384

    Democritus

    Democritus
    Democritus was an ancient Greek philosopher who developed the theory for the cosmos. The theory basically was that everything is composed of “atoms” and this is what started the atomic theory. He also stated that between atoms lies empty space, and that atoms will always be in motion. His beliefs were some what accepted however philosophers like Aristotle argued it.
  • John dalton

    John dalton
    John Dalton was an English chemist, he was known for his contributions to atomic theory. Dalton published his table of relative atomic mass, six elements were on this table: hydrogen, oxygen, nitrogen, carbon, sulfur, and phosphorus. Addition he believed that all atoms from a certain element are the same, and that elements were created by particles called atoms, which can not be created or destroyed. Till this day the statement that elements are made up of the same atoms has not been proved wron
  • Antoine Lavoisier

    Antoine Lavoisier
    He was named the "father of modern chemistry", he was a French nobleman in the histories of chemistry and biology. He stated the first version of the law of conservation of mass, recognized and named oxygen, and hydrogen. He abolished the phlogiston theory and helped construct the metric system, He wrote the first extensive list of elements, and helped to reform chemical nomenclature. He discovered that, although matter may change its form or shape, its mass always remains the same.
  • Joseph Proust

    Joseph Proust
    Proust is best known as a french chemist, particularly for his enunciation of the law of definite proportions. The essence of Proust’s law is that chemical substances only truly combine to form a small number of compounds, each of which is characterized by components that combine in fixed proportions by weight. His beliefs were were not at first accepted but later on were.
  • J.J Thompson

    J.J Thompson
    J.J Thomson was a British physicist who was accredited for discovering electrons, isotopes and inventing a mass spectrometer. Thomson proved that electrons existence after completing the cathode rays experiment. The experiment was based on estimating the mass of the cathode rays by measuring the heat generated which he concluded that the rays are very light negatively charged particles called electrons.
  • Robert Milikan

    Robert Milikan
    Robert Milikan was an American experimental physicist, and Nobel laureate in physics for his measurement of the charge on the electron and for his work on the photoelectric effect. in 1909 Millikan worked on an oil-drop experiment in which they measured the charge on a single electron. His experiment measured the force on tiny charged droplets of oil suspended against gravity between two metal electrodes.
  • Ernest Rutheford

    Ernest Rutheford
    Ernest Rutherford is reffered to the father of nuclear physics as he was a chemist and a physicist. He discovered the theory of radioactive half life. He also researched and concluded the differences between alpha and beta radiations. The biggest contribution he is known for is he was the first person to conduct a splitting of an atom.
  • Neils Bohr

    Neils Bohr
    Neils Bohr scientific achievments have impacted our science today and the way we understand it. He was focused on the structure of an atom and in 1913 he completed his theory of the atomic structure. He combined Ruthfords work and Quantums theory together to come to his conclustion. He discovered the outter orbit of an atom can hold more electrons than the inner orbit. Because of his hard work and dedication to the atomic structure he revieced the Nobel Prize in Pysics in 1922
  • Arnold Sommerfeld

    Arnold Sommerfeld
    Arnold Sommerfeld is a German physicist who contributed to the atomic theory in mathematical approaches. He extended Neil Bohr’s theory by including elliptical paths for electrons. Sommerfeld formulated and equation for the structure of spectral lined and a general quantum theory about it by applying it to the structure of metals. He then worked out a theory of electron in metals with the help of published theories from scientists which lead him to this conclusion.
  • Irving Languimer

    Irving Languimer
    Irving Langmuir was an American chemist and physicist. He introduced the concept of electron temperature as her built on Gilbert N. Lewis’s cubical atom theory as he outlining his "concentric theory of atomic structure". Languimer invented the diagnostic method for measuring both temperature and density with an electrostatic that is now called Languimer probe.
  • Erwin Schrodinger

    Erwin Schrodinger
    Erwin Schrodinger is an Austrian physicist who assisted in quantum theory by creating a formula “Schrodinger Equation”. It describes the form of the probability waves that govern the motion of small particles and how these waves are affected by external manipulations. He also constructed the “the electron theory” as Schrodinger resembled the electron cloud as the likely location of the movement of particles.