Across
- 2. above element symbols
- 5. positive charge
- 7. two or more species of atoms
- 9. negative charge
- 10. atoms splitting into smaller nuclei
- 12. reaction in the atomic nucleus
- 13. electricity by using heat from nuclear fusion.
Down
- 1. neutral charge
- 3. radioactive isotope
- 4. neutral charge
- 6. time it takes for radioactive isotope to decay
- 8. positively charged
- 11. below element symbols