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ATOMIC THEORY

      Poster activity + questions

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The History of the Atom - A Cooperative Learning Activity

 

The structure of this activity is entitled Jigsaw.  Each member of the team is responsible for a specific part of the activity.  As “experts” or “specialists” you must be able to teach your part to your teammates.  With that goal in mind, members of each base group leave and form expert teams by topic, e.g. Dalton’s Model.  In your expert teams you must master the material and decide how best to teach it to the members of your base group.  Finally, as experts, you return to your base groups and take turns using your expertise to teach each other about your topic.  You will create a timeline poster including all of the scientists containing the information required.  Poster requirements are listed below.

 

The Activity

 

Objective: to develop a historical model of the atom from prehistoric times through the beginning of the twentieth century and illustrate it.

 

Time Frame:  Three class periods will be allotted for the completion of this activity.

 

• Break up into expert groups by topics.The topics are:

  • Aristotle, Dalton and Democritus

  • Niels Bohr

  • Ernest Rutherford

  • JJ Thomson

  • Robert Millikan & James Chadwick

 

• Begin collecting information about your topic using the internet (no Wikipedia allowed).Cite sources.

 

• Use the following questions and directives as a guideline for gathering information.Do not limit your information to just these questions.

  • What time period does your model cover?

  • What special equipment did the scientists use to develop and support their model?

  • What was the major discovery that led to the development of this model?(Hint: look at your answers to question D above and think.The answer lies in the equipment design and what is needed to operate it).

  • Draw an illustration of the model of that atom.

 

• Take notes on the material you read.

 

• Record your sources on the back of your poster.

 

• As an expert group, determine what information you feel is most important to teach to your individual base groups.Go over your questions above and questions pertaining to each model to the remainder of your group.

 

• At the end of the allotted time, return to your base group and use your expertise to teach the development of your model of the atom to your group members.In addition, with your group, draw a time-line of the history of the development of the atom.Each student should have a timeline.Be certain your time-line includes what discovery or technology facilitated the development of each of the five models and why each of the models had to be changed.

 

 

 

• Answer only the following questions that apply to your topic:

  • What did Democritus say about the atom?

  • What did Aristotle believe about the atom?

  • Why was Aristotle considered correct over Democritus based on their time period?

  • Explain the parts of Dalton’s Atomic Theory.

  • What was significant about Dalton’s Atomic Theory as opposed to what Democritus or Aristotle supported?

  • Which portions of Dalton’s Atomic Theory are still considered correct?

  • What are cathode rays?

  • Describe JJ Thomson’s Cathode Ray Experiment.

  • What particle did Thomson discover?

  • Describe Thomson’s “Plum Pudding” model of the atom.

  • Describe Robert Millikan’s Oil Drop Experiment.

  • What did Robert Millikan discover about the electron?

  • Which subatomic particle did James Chadwick discover?()

  • Describe Ernest Rutherford’s Gold Foil Experiment.

  • Describe Rutherford’s model of the atom.

  • Describe Rutherford’s model of the atom.

  • Describe Bohr’s model of the atom.

  • Explain why Bohr’s model of the atoms is sometimes called the planetary model.

  • Explain why electrons orbit around the nucleus.

 

• Poster Requirements

  • Poster should be on 8 ½ x 11 sheet of paper (landscape) - Information must be neatly hand-written

  • Picture(s) of the person(s) – .

  • Date of the contribution

  • Hand-drawn image of any equipment or apparatus used/invented

  • Hand-drawn model of the atom, based on the scientist/philosopher’s theory

  • Description of the experiment – how it worked, and how the results contributed to the current theory of the atom.

  • What was the ultimate result of the experiment?

 

Requirement

Points Earned

Poster:

1 pt   Group Members, etc.

7 pts  Pictures of scientists/philosophers--cite sources

7 pts  All scientists listed

7 pts  Description of experiments--cite sources

7 pts  Picture of equipment/apparatus/experiment-cite sources

7 pts  Hand-drawn model of the atom for each scientist/philosopher

7 pts  Discovery-cite sources

7 pts for citing all Sources

 

50 pts Worksheet questions

 

Total Points = 100

 

 

ATOMIC THEORY

The History of the Atom - A Cooperative Learning Activity

Student Worksheet

 

1. What did Democritus say about the atom?

2. What did Aristotle believe about the atom?

3. Why was Aristotle considered correct over Democritus based on their time period?

4. Explain the parts of Dalton’s Atomic Theory.

5. What was significant about Dalton’s Atomic Theory as opposed to what Democritus or Aristotle supported?

6. Which portions of Dalton’s Atomic Theory are still considered correct?

7. What are cathode rays?

8. Describe J J Thomson’s Cathode Ray Experiment..

9. What particle did Thomson discover?

10. Describe Thomson’s “Plum Pudding” model of the atom.

11. Describe Robert Millikan’s Oil Drop Experiment.

12. What did Robert Millikan discover about the electron?

13. Which subatomic particle did James Chadwick discover?()

14. Describe Ernest Rutherford’s Gold Foil Experiment.

15. Describe Rutherford’s model of the atom.

16. Diagram of Rutherford’s model of the atom.

17. Describe Bohr’s model of the atom with a diagram.

18. Explain why Bohr’s model of the atoms is sometimes called the planetary model.

19. Explain why electrons orbit around the nucleus.