Across
- 4. Center of an atom
- 6. Most penetrating particle
- 8. time taken for an isotope to lose half of it's value
- 10. Positively charged particle
- 11. Located in the nucleus, has no charge
Down
- 1. Least reactive nobel gas
- 2. Most penetrating form of radiation
- 3. Most ionising form of radiation
- 5. Orbit of an electron
- 7. negatively charged particle
- 9. Creator of the plum pudding model