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Atomic Structure Period 2
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John Dalton
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http://fur.ly/24v5 |
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Hello, I am John Dalton and I lived in England from 1766 to 1844. I was a schoolteacher during my life but I also was a chemist. I created the 4 part atomic theory. The theory stated all elements are composed of tiny particles named atoms. Atoms of the same element are the same. The atoms of different elements can be physically together but never chemically combined. The 4th part states that chemical reations occur when atoms combine, separate, join or rearranged. My model of the atom is simply a whole indestructible particle with no internal structure. This model is no longer accepted.
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J.J. Thomson |
http://fur.ly/24ya
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Hello, my name is J.J. Thompson. I was born in the great country of England in 1856. I, J.J., won a Nobel Prize for discovering the electron through my invention of the cathode ray through gases at low pressure. In 1897, I sealed gases in a glass tube fitted at both ends with metal disks. The metal disks, or electrodes, were connected to a source of electricity. I believed that the atom was like raisin bread, so it was sometimes referred to as the raisin bread or plum pudding model. My beliefs were in fact accepted by society. Cheerio! Thanks for stopping by!
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Ernest Rutherford |
http://fur.ly/24ye
http://www.chemheritage.org/
discover/chemistry-in-history/themes/atomic-and-nuclear-structure/rutherford.aspx
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My name is Ernest Rutherford. I was born on August 30, 1871 in Nelson, New Zealand. After the discovery of radiation in 1896 by Becquerel, I identified the 3 main components of radiation and I named them alpha, beta, and gamma rays. This lead me to believe that an atom contained a small, dense, positively charge nucleus which is surrounded by a negatively charged electron cloud in 1911 when I conducted the Gold Foil experiment, which took massive alpha particles and directed them at a sheet of gold foil. Later on, in 1919, I conducted the most important experiment of my career: the first transumation. I bombarded Nitrogen gas with alpha particles to produce an unstable Fluorine isotope. The Fluorine isotope quickly decomposed into a stable oxygen isotope and a proton. This lead to the discovery of protons. I merely believed that it was a Hydrogen ion. My theory of atomic structure was accepted by the scientific community and even after my death on October 19, 1937, my ideas are still accepted today. I was the 1908 Nobel Prize in Chemistry and knighted in 1914. |
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Electron Cloud |
http://fur.ly/2557
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My name is Erwin Schrodinger. I was born in Austria on August 12, 1887. My work was done from the 1920's until the 1940's. I determined it is impossible to tell where an electron is. My work was used by Louis de Broglie and Werner Heisenberg. de Broglie suggested thet electrons, like light, behaved as a wave Heisenburg came up with the uncertainty principle, which states that electrons can't be seen with light and then predicted to be in a certain area. I wrote all the functions for the experiment, and discovered the orbitals and density clouds. The cloud model shows that electrons will be in a radius around the nucleus but not in a certain defined area. |
Atomic Structure Period 2
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