4. Nuclear Chemistry

5. Fission Fission: Division of a heavy nucleus into two or more smaller nuclei. (Used in weapons and power plants)

6. Fusion Fusion: Combining two light nuclei. Releases more energy than fission. (Used in weapons. Still working on power plants)

7. Alpha Helium Nucleus Positive charge Easily stopped Mass # of atom:-4 Atomic # of atom: - 2

8. Beta Electron (- charge) Mass # of atom same, atomic # of atom + 1 0 e

9. Gamma High energy electromag. Wave Mass # of atom same Atomic # of atom same 0000 Y

11. Balancing Nuclear Equations The Mass #s and Atomic #s have to be equal on both sides of the equation.

12. 234 90 Th 238 92 U

13. Beta Equations 131 54 Xe 0 e

14. 127 51 Xe + + 0000 Y

15. Nuclear Radiation – particles and electromagnetic waves that are flung at high speeds from nucleus. Q: Why does it happen? A: Unstable nuclei! Q: Why unstable? A: # of neutrons

16. Warm Up 9/19 What discovery did the gold foil experiment lead to?

17. Rutherford’s Gold Foil Experiment Fired particles at gold foil Some particles bounced back Why? Because of the dense central nucleus

18. Superhero! Your job is to create a superhero that can block that type of radiation. Include all of the information in your folder on your poster.

19. Particle & Symbol ChargeWhat it is Blocked by Alpha Beta Gamma