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time line

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austin ewing

on 9 October 2012

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Transcript of time line

Atomic Theory Time Line Bohr- 1922- atomic structure, outer orbit can hold more electrons than inner orbit Rutherford 1898-1911 -alpha particles in gold foil -alpha beta and Gama rays -nucleus very dense small positive charge electrons outside nucleus Moseley x-ray tube -atomic number determined positive charge of nucleus and atomic number equal to the number of protons in nucleus- reorganized periodic table based on atomic number Millikan -1909- charge and mass of electrons -oil drop experiment- positvely charged atoms Democritus- 400.Bc -atom particles Lavoisier -1774- cumbustion theory-named oxygen- proposed law of conservation of mass Prost- 1799 -law of constant composition-law of definite proportion- a given compound always has the same elements in the same proportion by mass Thomson -1897- proposed law of multiple proportions, mole and symbols to represent atoms Chadwicks- 1932- Neutrons, discovered a neutral atomic particle with mass close to Protron-lead to atomic bomb and fission Dalton -1803 -proposed of atomic theory-spherical solid atoms based on measurable properties of mass gold foil experiment- 1911- neutrons- most of volume was empty space occupied by electrons- center positively charged in center Schrodinger -1930 -electrons has continuous cloud wave mechanics-math model of atom-quantum mechanical model Marie Curie- 1869 -created perodic table -arranged by increasing atomic weighs and left spaces for new elements. Cathode ray tube experiment -1897- made the tube glow -Experimented by passing high voltage threw a tube Law of Definite proportions -1800- elements in a given combine in the same proportion by mass --they burned a piece of wood to see if the mass would change - it didn't. Plum pudding atomic model -1897- changed how viewed atoms -Thomson said negatively charged electrons were evenly distributed throughout a positive soup -like plums in a pudding. Bohr planetary model -1913 -positive nucleus and negative electrons orbiting around- outer obit hold more -when they jump they emit light -led to quantum mechanics Law of conservation of mass -1789- mass of product equals mass of reactant Dalton's atomic theory -1803- atoms 1.Elements are made of extremely small atoms. 2.Atoms of an element are identical. 3.Atoms cannot be subdivided, created or destroyed. 4. atoms combine to form compounds. 5.in reactions atoms are combined, seperated or rearranged. Rutherford model -1911 -mass concentrated in nucleus all protons in nucleus and electrons orbit nucleus like planets orbit sun Quantum Mechanical Model 1920-1930 based on mathmatics -atom has orbital clouds- Werner Heisenberg and Schrodinger Venezianl -1968- dual resonance model String theories-1970- universe of vibrating strings Edward Witten-1995-M-theory- unification of superstring -the 2nd super string revolution Higgs -2012- Higgs boson particle-predicted in standard theory -one of 17 particles called bosons-is responsible for all forces in nature but gravity Austin Ewing and Javi Davila HISTORY OF
ATOMIC THEORY
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