Download Name: Atomic Structure Webquest Atom Basics http://www

Name: ______________________________
Atomic Structure Webquest
Atom Basics
http://www.chemtutor.com/struct.htm Read the section “And you thought you were strange” to complete table.
Subatomic Particle
Location within the atom
Electrical Charge
1.
2.
3.
Early Ideas about Atoms
http://galileo.phys.virginia.edu/classes/252/atoms.html Read the section on “Early Greek Ideas” to answer the
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
http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html
7. When did Dalton form his Atomic Theory?
8. What are the four components of Dalton’s Atomic Theory?
9. What two parts of Dalton’s theory have been modified?
JJ Thomson’s Experiment
http://study.com/academy/lesson/jj-thomsons-cathode-ray-tube-crt-definition-experiment-diagram.html
10. What device did JJ Thomson use in his experiment? When did he conduct his experiments?
11. What did JJ Thomson discover? _____________________
12. You may be familiar with old _______________________ that used CRT technology.
13. The cathode ray is actually a flow of _______________.
14. How did the cathode ray react to the positive end of the magnet? What did JJ Thomson conclude?
15. JJ Thomson’s model of the atom was called the Plum Pudding Model. Google the Plum Pudding Model and draw a
representation below.
Rutherford’s Experiment
http://www-outreach.phy.cam.ac.uk/camphy/nucleus/nucleus5_1.htm
16. Rutherford fired radioactive alpha particles at a very thin sheet of gold foil. Look at the animation. What is
happening to most of the alpha particles (red)? Why is this happening?
17. Click next. Look at the animation. What are the alpha particles bouncing off of?
18. Click next. What part of the atom did Rutherford discover?
19. Rutherford proposed that the atom contained a _____________________ containing all of its positive charge, and
that the much lighter ____________________were ____________________this nucleus.
20. Why did most alpha particles pass through the gold atoms?