Stable and Radioactive Isotopes

We began the class period with the following entry task: How are carbon-12, carbon-13, and carbon 14 similar?  How are they different?  Which isotope would you expect to find most often in nature?  Explain your thinking.

Next, we watched a segment of the NOVA video Hunting the Elements, beginning at 1:39:33 and ending at 1:52:04.  The video served to remind students about last week’s lesson about isotopes (Lesson 13) and to help prepare them for our work this week.

After the video, we reviewed the Lesson 14 PowerPoint.  Students then received copies of the Lesson 14 Worksheet and the Chart of Naturally Occurring Isotopes. working in pairs to complete the lesson by the end of the class period.

Homework for this evening:

  • Read Lesson 14 in the textbook.  Login via and enter your username and password:
    • Username: wahps****s-####### (**** = first 4 letters of your last name and ####### = student number).  Remember to include the dash between s and #.
    • Password: S-####### (the S must be capitalized)
  • Work through the homework problems at the end of Lesson 14 and then verify accuracy with the Lesson 14 Homework Answers.
  • Write notes for Lesson 14 on the Chapter 03 Notes handout.
  • Come to class tomorrow prepared to ask questions about anything of the homework problems from Lesson 14 you did not understand.