New information needed to be introduced with parent and daughter isotopes.
Paul, MN, based on an original activity retrieved from also with the help of Jenni Johansen (other 8th grade science teacher at So. Paul Junior High School In this activity, students gain a better understanding of radioactive dating and half-lives.
Daughter isotopes are represented by the M side down (stable).
If half of the uranium-238 has turned into lead-206 the rock will be 4500 million years old.
Students use M&Ms to demonstrate the idea of radioactive decay. Parent isotopes are represented by the M side up (radioactive).
Class size can vary, but activity should be done in groups of 2-3.