Reflection: Grappling with Complexity How The Electron Was Discovered - Section 2: Teacher Demonstration


Be very careful when presenting these two atomic models (Dalton's Atomic Model, J.J. Thomson's Plumb Pudding Model) as they are incorrect. I only include these in our discussion to provide a frame of reference to our current atomic model. You would not want to place a science misconception in your student's brain. Misconception are difficult to overcome once they have become established. Typically students will construct elaborate explanations that allow these initial misconceptions to remain true to the child.

  Do not overemphasize these atomic models
  Grappling with Complexity: Do not overemphasize these atomic models
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How The Electron Was Discovered

Unit 4: Atomic Structure
Lesson 3 of 5

Objective: Students will be able to explain how the electron was discovered by J.J. Thomson and the contribution it made to our current atomic model.

Big Idea: Students always ask me how can we know what at atom looks like if we can't see them. This lesson is part two of three explaining how we developed our modern atomic model using the discovery of the electron.

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  45 minutes
jj thompson
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