1. Date: 3-18 Topic: Ch4.4 Glen Chem.

2. Overview Objective Warm-up Standard ESLR Notes Classwork Homework Dispatch Summary

3. …relationship between unstable nuclei / radioactive decay. …alpha, beta, and gamma radiation in terms of mass and charge.

4. 1. Effective Communicators

5. Title: Radioactivity

6.  Ch 4 handout to tomorrow  ch 4 half-sheet due tomorrow

7.  Ch 4 Handout  Due tomorrow

8. 11c. … some naturally occurring isotopes of elements are radioactive, as are isotopes formed in nuclear reactions. 11d. … the three most common forms of radioactive decay (alpha, beta, and gamma) and know how the nucleus changes in each type of decay.

9. Radiation protection technicians use radiation measuring instruments to locate /assess the risk posed by contaminated materials. Then they decontaminate the area with high- pressure cleaning equipment and remove the radioactive materials.

10. How would you go about removing radioactive material?

11. 232 90 Th ---> 228 88 Ra + 4 2 a Name the three elements Thorium, radium, alpha

12. A. Unstable atoms gain stability by losing energy. They loose energy by emitting radiation “Radioactive decay”

13. B. Alpha radiation contains 2 protons and 2 neutrons amu=4 charge +2

14. C. Beta decay An atom gives off an electron amu= 1/1840 charge -1

15. D. Gamma decay A photon is given off no mass and no charge

16. E. Neutron to proton ratio must be balanced for a chemical equation Mass number and atomic number

17. F. …Radioactive atoms undergo enough radioactive decay to reach a stable form of the atom.

18. G.