You may group them in any size, but working in pairs is optimal for this exercise.Weigh out 80 candies for each group into cups before students arrive, as described in the Planning Ahead section above.After students have completed the activity, discuss the answers to the analysis questions with the whole class.
This method of measuring a rate won't work for radioactive decay.
To help students understand the history of radioactivity, have them go to Radioactivity: Historical Figures, on the Access Excellence Classic Collection site, to read about the contributions of Wilhelm Roentgen, Antoine Becquerel, Marie and Pierre Curie, and Ernest Rutherford.
As students read about these scientists, ask them to think about the following questions: Students can supplement this site with a visit to Isotopes Project.
Students should complete the Analysis section of the lab sheet, which will be used as part of their assessment.
Advise students to read through the simulation first so that they understand what they should do.
"Today we will simulate radioactive decay to understand what we mean by half-life.