Reflection: Adjustments to Practice Aren't You Just a Ray of Negativity? - Section 2: Opener


I expected the Paula Abdul video to loosen up the class.  Starting fresh on a Monday, I was actually counting on it.  Instead, the students barely cracked a smile.  While they cited the connection to the atom "opposites attract", it did not make the connection I was hoping for.

Nor did it cement the idea that opposites attract.  Throughout the next two weeks, I had students explain that positive attracts positive, and negative attracts negative.  This gap in basic prior knowledge was what I was hoping to fill in this lesson, but for many students, it still didn't fit the bill.

  A swing and a miss...
  Adjustments to Practice: A swing and a miss...
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Aren't You Just a Ray of Negativity?

Unit 1: Atomic Structure
Lesson 4 of 10

Objective: SWBAT describe the experiments that led to the discovery of the electron, with particular focus on how like charges interact.

Big Idea: Thomson's cathode ray experiments led to an early model of the atom based on oppositely charged parts.

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jj thomson
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