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History of the Atom Timeline

History of the Atom Timeline. Created by Kenneth Thompson. 460 BC - Democritus. He could explain all changes in the world as changes in motion of the atoms.

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History of the Atom Timeline

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  1. History of the Atom Timeline Created by Kenneth Thompson

  2. 460 BC - Democritus • He could explain all changes in the world as changes in motion of the atoms. • He held that there are smallest indivisible bodies from which everything else is composed, and that these move about in an infinite void space. • He built an ethical theory on top of his atomist philosophy. Photo retrieved from: http://www.vecip.com/default.asp?onderwerp=975

  3. 1803 – John Dalton • He arrived at his view of atomism by way of meteorology • He proceeded to calculate atomic weights from percentage compositions of compounds • Dalton came with his Atomic theory as a result of his research into gases. He discovered that certain gases only could be combined in certain proportions even if two different compounds shared the same common element or group of elements. Photo retrieved from: http://www.proyectosalonhogar.com/Biografias_Mundiales/biografia/d/dalton.html

  4. 1869 – Dmitri Mendeleev • He investigated the thermal expansion of liquids. • He predicted the existence and properties of new elements and pointed out accepted atomic weights that were in error. Photo retrieved from: http://www.if.ufrgs.br/tex/fis142/fismod/verbetes/mendeleev.html

  5. 1885 - Eugene Goldstein • He coined the term "cathode rays“. • showed that cathode rays can cast shadows, then demonstrated how such rays are emitted • Goldstein's work suggested the presence of the proton Photo retrieved from: http://www.edu.delfa.net/Interest/biography/G/goldstein.htm

  6. 1896 - Henri Becquerel • His earliest work was concerned with the plane polarization of light. • He also worked on the subject of terrestrial magnetism. • His previous work was overshadowed by his discovery of the phenomenon of natural radioactivity. Photo retrieved from: http://media.isnet.org/iptek/100/Becquerel.html

  7. 1897 - J.J. Thomson • Early interest in atomic structure was reflected in his Treatise on the Motion of Vortex Rings which won him the Adams Prize. • Important suggestions as to the structure of the atom. • Discovered a method for separating different kinds of atoms and molecules by the use of positive rays. Photo retrieved from: http://staff.fcps.net/jswango/histofatom.html

  8. 1907 - Ernest Rutherford • He claimed that nuclei of certain light elements, such as nitrogen, could be "disintegrated" by the impact of energetic alpha particles coming from some radioactive source. • The whole mass of the atom and at the same time all positive charge of the atom is concentrated in a minute space at the center. Photo retrieved from: http://staff.fcps.net/jswango/histofatom.html

  9. 1910 – Robert Millikan • His earliest major success was with the accurate determination of the charge carried by an electron. • He occupied himself with work concerning the hot-spark spectroscopy of the elements extending the ultraviolet spectrum downwards far beyond the then known limit. • During World War I, Millikan was Vice-Chairman of the National Research Council, playing a major part in developing anti-submarine and meteorological devices. Photo retrieved from: http://www.physicsdaily.com/physics/Robert_Millikan

  10. 1913 - Neils Bohr • He directed his research on the constitution of the atomic nuclei. • By accident, he stumbled across Balmer's numerology for the hydrogen spectrum, and in a flash came up with a workable model of the atom. • His work on the structure of atoms earned him the award of the Nobel Prize in 1922. Photo retrieved from: http://staff.fcps.net/jswango/histofatom.html

  11. 1913 - Frederick Soddy • He was a man of strong principles and obstinate views. • He discovered the element helium was produced in the radioactive decay of a sample of radium bromide and that helium was evolved in the decay of emanation Photo retrieved from: http://www.prix-nobel.org/EN/Chemistry/soddy.html

  12. 1925 – Werner Heisenberg • At the end of the Second World War he, and other German physicists, were taken prisoner by American troops and sent to England. • He was interested in working on problems of plasma physics and thermonuclear processes. Photo retrieved from: http://www.dra.de/online/dokument/2005/februar.html

  13. 1932 – James Chadwick • During World War I, he was interned in the Zivilgefangenenlager, Ruhleben • He succeeded that year in disintegrating atoms by bombarding nitrogen with alpha particles, with the emission of a proton. • He proved the existence of neutrons. Photo retrieved from: http://www.prix-nobel.org/DE/Physik/chadwick.htm

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