Across
- 2. What radiation has no charge
- 3. What radiation has a negative charge
- 6. What type of radiation is helium
- 8. Who made the equation E=mc2
Down
- 1. What radiation has the most penetrating rays
- 4. What radiation has a positive charge
- 5. what is the rate of decay of radioactive isotope
- 7. what is called when the atoms react to each other