Atomic Theories & Models

The following Webquest will help you review content covered throughout lecture and discussion.  It will help you review topics such as:

Atom Basics

Early Ideas About Atoms

John Dalton's Atomic Theory

J.J Thomson & the Electron

Chadwick, Rutherford, and the Atomic Nucleus

History of the Atom

This item is not a graded assignment but very useful when it comes to reviewing information that will be covered on the test.

Your task is to complete the following Webquest worksheet as a review for your final summative assessment over the atomic theory unit.  Answer each question(except for tables or drawings) with complete sentences and to the fullest depth of your content knowledge.

Webquest: Atomic Theories and Models 

Answer the following questions, using complete sentences on all questions except on the tables.

Atom Basics: Go to: http://www.chemtutor.com/struct.html , read “And you thought you were strange” and answer the following questions.

1. What are the three subatomic particles that make up all atoms?
   
   
   
   

2. Where are the two areas that subatomic may be located?

3. What are the locations of each of the subatomic particles?

4. What is the electrical charge of each subatomic particle?

Early Ideas About Atoms: 

Go to http://galileo.phys.virginia.edu/classes/252/atoms.html , read “Early Greek Ideas” and answer the following questions:

1. Democritus and Leucippus proposed what basic ideas about matter?
   
   
   
    
2. Different physical properties were explain using what proposed ideas?
   
   
   
   
   
3. These ideas were received how by Aristotle and the progress for the next 2000 years resulted in what? 

John Dalton’s Atomic Theory: 

Go to http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html and answer the following questions: 

1. When did Dalton form his Atomic Theory?


  

2. What is Dalton’s Atomic Theory?

J.J. Thomson and the Electron: 

Go to http://www.chemheritage.org/classroom/chemach/atomic/thomson.html and answer the following questions: 

1. When did J.J. Thomson discovered the electron? 

2. Why did they believe there were objects smaller than atoms? 

3. What was the model of the atom he proposed in 1904? 

Rutherford and Bohr Break the “Plum Pudding” Model:

Go to http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html and answer the following questions: 

1. Explain the “plum pudding” model of the atom?
   
   
   
   
2. According to Rutherford, how much smaller was the nucleus, than the atom itself? 
   
   
   
   
3. Describe Bohr's atomic model?
   

Chadwick (and Rutherford) and the Neutron: 

Go to http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html answer the following questions: 

1. What is the atomic number?
   
   
   
   
2. What is atomic mass?
   
   
   
   
3. What led Chadwick to propose there must be something besides just the proton in the nucleus of atoms?
   

History of the Atom Timeline 

Click the following link: http://cstl-csm.semo.edu/cwmcgowan/ch181/atomhist.htm and fill in the History of the Atom Timeline. Use the following clues to help you. Make sure that all of the dates and all of the inventors are filled in. 

Hints: 

1. My famous quote was disputed by Aristotle, although time proved me correct. 

2. In what date was it determined that matter can neither be created nor destroyed. Name the date and the scientist 

3. Name the date and inventor of the modern version of the Atomic Theory 

4. He developed the plum pudding model and also was the first to discover the ________ .

5. Determined the unit charge of the electron, thus allowing for the calculation of the mass of the electron and the positively charged atoms.

6. This scientist demonstrated that the atom is mostly empty space with a small positively charged nucleus containing most of the mass and low mass negatively charged particles orbiting this nucleus. He was also credited with naming ______ and ______ . 

7. Name the date and inventor whom discovered the last subatomic particle

History of the Atom Timeline:

As a student you should now know at what level of studying you should pursue to acheive the desired grade.  If you recieved a score of 2 or 1 on the rubric on any portion of the webquest please come see me so I may provide some additional instruction before the assessment occurs.

http://www.chemtutor.com/struct.html 

http://galileo.phys.virginia.edu/classes/252/atoms.html 

http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html 

 http://www.chemheritage.org/classroom/chemach/atomic/thomson.html

http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html 

http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html 

 http://cstl-csm.semo.edu/cwmcgowan/ch181/atomhist.htm

Mr. Rasby

crasby@lpslions.org