Across
- 3. Atom emits mass and energy
- 4. protons + neutrons
- 6. number of protons
- 8. Atomic number
- 9. From the sun
- 10. Center of atom
- 11. Substance decay by half
- 12. Different mass number
Down
- 1. strongest radiation
- 2. series of affected events
- 5. Used for atomic bombs
- 6. Helium nucleus
- 7. Negatively charged decay particle
- 10. Mass - atomic =