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Development of the Atomic Theory Introduction: If you were asked to draw the structure of an atom, what would you draw? Throughout history scientists have accepted five atomic models. Our perception of the atom has changed from the early Greek model because of evidence that has been gathered through scientific experiments. As more evidence was gathered old models were discarded or improved upon. Your goal is to trace the atomic theory through history. Task: 1. You and your partner will search the Internet sources provided to learn more about the scientists and discoveries that have led to our current knowledge of the structure of the atom. 2. Using your research, construct a timeline within a Power Point presentation as a visual representation of the development of modern atomic theory. 3. Describe and find a representative image for the five historical models of the atom - Democritus, Thomson's Plum Pudding, Rutherford, Bohr, and Modern Electron Cloud. Process: You will be assigned 1 partner. Read the entire Web Quest. Read your textbook Chapter 11 Section 1. Use any of the following Web sites to get information about listed scientists and their discoveries that were not in your text. You may search other Web sites on your own or use library resources. Include the following on your timeline: 1. Names of all scientists mentioned in VBO 8.2.1. 8.2.1 - Describe the historical development of the concept of the atom and the periodic table including the contributions of Democritus, Dalton, Thomson, Rutherford, Bohr, Mendeleev, and Moseley. 2. The year(s) of the scientist’s discovery and/or contribution. 3. In 1-2 sentences tell the importance of the discovery that relates to the structure of the atom or the periodic table (some of these people did many types of research). 4. Include the five historical models of the atom – Democritus, Thomson's Plum Pudding, Rutherford, Bohr, Modern Electron Could model. A timeline is in chronological order – earliest time to latest time. Resources: History Atomic Structure Timeline: http://www.watertown.k12.wi.us/HS/Staff/Buescher/atomtime.as p (Click cancel if asked for a password) Atom - The Incredible World: http://library.thinkquest.org/19662/low/eng/index.html Atomic Structure Table of Contents: http://www.dbhs.wvusd.k12.ca.us/webdocs/AtomicStructure/Ato micStructure.html List of Historical Contributors and Developments Related to Atomic Theory: http://www.hometown.aol.com/eilatlog/taxons/history.html Encarta Atom: http://encarta.msn.com/encyclopedia_761567432_9/Atom.html The History of Atomic Theory: http://www.lancs.ac.uk/ug/cooked1/index.htm (info about Thomson's Plum Pudding under Modern Atomic Theory section) History of the Atom: http://www.winneconne.k12.wi.us/middle_school/7th%20Grade/LENZ/Mr.% 20Lenz's%20Page.htm (Click cancel if asked for a password. Go to Chemistry link at bottom left, then to History of Atomic Theory at top left on next page.) Models The Atom - Info and Democritus, Plum Pudding, Rutherford Models: http://www.lbl.gov/abc/wallchart/chapters/02/1.html Modern Model of the Atom: http://www.aplus.net/tom/mercer/edsc651physci/modelatom.htm Plum Pudding and Bohr Model: http://wwwoutreach.phy.cam.ac.uk/camphy/nucleus/nucleus1 History of the atom - Info and Plum Pudding, Rutherford, Bohr models: http://www.broadeducation.com/htmlDemos/AbsorbChem/HistoryAtom/pag e.htm Mendeleev: http://en.wikipedia.org/wiki/Mendeleev http://www.aip.org/history/curie/periodic.htm http://www.chemistry.co.nz/mendeleev.htm Moseley http://www.corrosion-doctors.org/Periodic/Periodic-Moseley.htm http://www.chemistry.co.nz/henry_moseley.htm http://mooni.fccj.org/%7Eethall/period/period.htm Evaluation: Category Dates/Scientis ts 9x-max 45pt Contribution to Atomic Theory 6x-max 30 pt 5 4 3 2 Most Few All scientists scientists Some scientists scientists listed Dates are listed or 2 listed or 3 out of listed or 4 correct and in out of order. out of order. order. order. 27 pt 45pt 36 pt 18 pt All contributions listed and apply to Atomic Theory. 30 pt 2-3 errors 4-6 errors contributio contributions n ns not ot listed or do listed or do not apply to not apply to Atomic Theory. Atomic 18 pt Theory. 7-9 errors contributio ns not listed or do not apply to Atomic Theory. Models of Atoms 4x-max 20 pt Attractiveness 1x-max 5 pt 24 pt 12 pt 4 models All 5 models shown shown correctly 3 models shown correctly and correctly and and correctly name correctly named. correctly d. named. 12 pt 20 pt 16 pt Timeline and models Timeline and are Timeline and models attractive in models are exceptional terms of are acceptably ly attractive in layout, attractive in terms of layout, neatness, terms of layout, neatness, and and use of neatness, and use of color. use of color. color. 2 models shown correctly and correctly named. 5 pt 8 pt Timeline and models are messy with no use of color. They are not attractive. 3 pt 4 pt 2 pt Back to top Conclusion: This assignment is based on 100 points. You can earn extra points by making models to display in the classroom or making a large timeline with pictures of the scientists. See the teacher for details. This assignment will allow you to observe how the Atomic Theory started as a philosophical idea and through quantitative experimentation, has been developed to include the current Electron Cloud Model. You will see that as scientists discovered more and more information they discarded parts of older theories to design an atomic model that provided a more accurate representation of the atom. It is important for scientists to challenge current theories and modify them as more knowledge becomes available. Your research provides you with a historical perspective of our knowledge of the atom's structure.