Webquest: Atomic Theories and Models

Name _____ Webquest: Atomic Theories and Models Answer these questions on your own, USING COMPLETE SENTENCES where appropriate (most...

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Webquest: Atomic Theories and Models Answer these questions on your own, USING COMPLETE SENTENCES where appropriate (most of the questions, except tables and drawings). Atom Basics: Go to: http://www.chemtutor.com/struct.html and read the “And you thought you were strange” section to answer the following questions (put answers in the table). 1. What are the three subatomic particles that all atoms are made of? 2. Where are each of the three particles located within the atom? 3. What is the electrical charge of each particle? 1. The 3 subatomic particles

2. Location within the Atom

3. Electrical Charge

Early Ideas About Atoms: Go to http://galileo.phys.virginia.edu/classes/252/atoms.html and read the section on “Early Greek Ideas” in order to answer the following questions: 4. What was the “basic idea” about matter that Leucippus and Democritus proposed?

5. How did they use atoms to explain different physical properties?

6. How were the ideas of these two men received by Aristotle, and what was the result on the progress of atomic theory for the next 2,000 years?

John Dalton’s Atomic Theory: Go to http://www.chemheritage.org/discover/online-resources/chemistry-inhistory/themes/the-path-to-the-periodic-table/dalton.aspx 7. What years did John Dalton live? What was his nationality and what was his profession?

8. What other science was John Dalton interested in that lead him to his view of atomism?

Go to http://chemed.chem.purdue.edu/genchem/history/dalton.html and use the information there to answer the following questions: 9. What year did Dalton propose his new atomic theory?

10. What are the five components of Dalton’s Atomic Theory?

J.J. Thomson and the Electron: Go to http://www.chemheritage.org/classroom/chemach/atomic/thomson.html and use the information there to answer the following questions: 11. What was J.J. Thomson’s nationality and his profession?

12. In what year did he discover the electron? 13. What was the evidence for “bodies much smaller than atoms”?

14. What was the model of the atom he proposed in 1904? What was the nickname of this model?

Rutherford and Bohr: Go to http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html and use the information found there to answer the following questions: 15. Ernest Rutherford had been a student of what important scientist?

16. In what year did Rutherford perform his experiments using alpha particles (Gold Foil Experiment)?

17. What observations during his gold foil experiment lead Rutherford to propose a new model of the atom?

18. What was the charge of the nucleus and how much smaller was it, than the atom itself, according to Rutherford?

19. Explain the problem that Bohr described with Rutherford’s model of the atom that had the electrons orbiting the nucleus like the sun around the earth.

20. How did Bohr modify this model of the atom (i.e. what was his “revolutionary idea” about electrons)?

21. Use the following link to draw a diagram of the Bohr model of the atom. http://abyss.uoregon.edu/~js/glossary/bohr_atom.html

Chadwick (and Rutherford) and the Neutron Go to http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html and use the information found there to answer the following questions: 22. During which war was Chadwick a prisoner of war? What year did he begin his work with Rutherford?

23. What subject was Chadwick researching?

24. What makes up the atomic number?

25. What observation led Chadwick (and Rutherford) to conclude there must be something besides just the proton in the nucleus of atoms?

26. What is the something-besides-just-the proton called?

History of the Atom Timeline Use the information in the websites above and through searches of your own to summarize the discoveries above into the timeline below. History of the Atom Timeline 1 Date:

Scientist:

Discovery:

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