1. Topic: Radioactive Particles Do Now: Stable or Radioactive? 1. Th-234 2. U-238 3. Ca-40 4. Ra-226

2. Transmutation-When an element turns into a different element by emitting a radioactive particle. This occurs when the number of protons changes.

3. Radioactivity – Rutherford again!

4. Penetration & Shielding Alpha particles have the least penetrating power Gamma waves have the greatest penetrating powwer

5. Turn to table 0 Add column for mass

6. 2 Neutrons & 2 Protons Charge = +2 Mass = 4amu 4 2 He

7. Beta Particle – fast moving electron Charge = -1 Mass = 0amu

8. Gamma Wave Charge = 0 Mass = 0

9. Positron Positive beta particle Mass 0 Charge +1

10. These subatomic particles that are emitted were discovered around 1900 Alpha rays Beta rays Gamma rays