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Name:_____ Date: _____ ATOMIC THEORY WEB QUEST Answer on your own sheet of paper 1. Google Dalton’s Atomic Theory...

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Name:____________________________________________ Date: _____________

ATOMIC THEORY WEB QUEST Answer on your own sheet of paper

1. Google Dalton’s Atomic Theory. List Dalton’s postulates. http://www.visionlearning.com/library/module_viewer.php?mid=49 Dalton’s ideas are summarized differently here. How is this summary different? What has been consolidated or omitted? Why?

Go back to the Timeline tab. 2. Scan the timeline to notice the substantial chemistry discoveries that occurred between Dalton and the discovery of the electron 90 years later! List a few significant discoveries.

3. Click on “The Electron.” Date: _________________ Scientist(s): __________________________ In his “Cathode Ray Experiment,” Thomson discovered the electron. Read the short summary. Click on the red link below. How did this change the current Dalton model? Which of Dalton’s postulates was proved incorrect?

Why did Thomson believe that electrons were in every element?

4. Google Rutherford – 1911.” Date: _________________ Scientist(s): __________________________ Illustrate and label the Gold Foil Experiment.

Name:____________________________________________ Date: _____________ What did Rutherford expect to occur in the experiment? What DID happen?

http://science.howstuffworks.com/atom6.htm. Click on The Rutherford Experiment within the text. What scientists actually carried out the experiment for Rutherford? What particles were “shot” at the gold foil? Describe these particles.

Summarize Rutherford’s addition to the atomic model.

5. Google Bohr 1913.” Date: _________________

Scientist(s): __________________________

Bohr revised Thomson and Rutherford’s scientist models with regard to the electron. How did he change the model?

Illustrate Bohr’s model and label the parts.

Click the Bohr model link in red to see more detail. 6. Google “Quantum Mechanics 1926.” Electrons became the focus with Bohr’s model in the early 1900’s. This idea of quantum mechanics says that electrons can be described using _____________ functions. 7. Google “Uncertainty Principle 1927.” Date: _________________ Scientist(s): __________________________ State the uncertainty principle in your own words.