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Atomic Model Timeline Designed by Susan Schmidt 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 clues or evidences that have 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: 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. Using your research, construct a timeline as a visual representation of the development of modern atomic theory. Draw the five historical models of the atom - Democritus, Thomson's Plum Pudding, Rutherford, Bohr, Modern Electron Cloud Process: Read the entire WebQuest. You can look in a textbook Chapter 4 Pg. 104-108. 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 13 scientists in the table below 2. The year of the scientists discovery 3. In 1-2 sentences tell the importance of the discovery that relates to the structure of the atom (some of these people did many types of research) 4. Draw the five historical models of the atom – Democritus, Thompson's Plum Pudding, Rutherford, Bohr, Modern Electron Cloud model. If you copy the models off the internet you will need to provide a source page with the website you copied the picture off of. Marie & James Ernest Antoine John Dalton Pierre Curie Chadwick Rutherford Lavoisier J.J. Democritus Thompson Joseph Louis Proust Neils Bohr Max Planck Robert Millikan Michael Faraday Aristotle A timeline is in chronological order – earliest time to latest time. Because you are going to keep your comments to 1-2 sentences, a graph or report will not be appropriate. You can hand write the whole assignment or you can create a timeline on a word document. I will be showing how to do this in class. Resources: History Atom - The Incredible World: http://library.thinkquest.org/19662/low/eng/index.html The Atom - Info and Democritus, Plum Pudding, Rutherford Models: http://www.lbl.gov/abc/wallchart/chapters/02/1.html 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.neoam.cc.ok.us/~rjones/Pages/online1014/chemistry/chapter_8/pages /history_of_atom.html Evaluation: Category 5 Dates/Scientists All points in this category are 2X All points in this 3 All scientists 12 scientists 9 scientists listed Dates are listed or 3 listed or 6 out correct and in out of order. of order. order. 10 Pts Contribution to Atomic Theory 4 All contributions listed and apply to Atomic Theory. 8pts 6pts 2-3 errors contributions not listed or do not apply 4-6 errors contributions not listed or do not apply 2 6 or fewer scientists listed or 9 out of order. 4pts 7-9 errors contributions not listed or do not apply category are 2X Models of Atoms Appearance/ Grammar, Spelling to Atomic Theory. to Atomic Theory. to Atomic Theory. 8pts 6pts 4pts 4 models are All 5 models are correct and correct and correctly correctly named. named. 3 models are correct and correctly named. 2 models are correct and correctly named. Timeline and models are Timeline and attractive in models are terms of exceptionally layout, attractive in terms of layout, neatness, and use of neatness, and use of color. 1-2 color. 3-4 Timeline and models are acceptably attractive in terms of layout, neatness, and use of color. Timeline and models are messy with no use of color. They are not attractive. 7-8 10pts Spelling errors. Spelling errors. Spelling errors. 5-6 Spelling errors. Conclusion: This assignment is based on 30 points. 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. Credits: This WebQuest is based on a template from The WebQuest Page and was last updated September 11, 2005. Textbook: Modern Chemistry, Holt, Rinehart and Winston Copyright 2002