Across
- 2. First actinide element
- 4. Radioactive noble gas
- 8. Named after Mendeleev, periodic table creator
- 11. Element in smoke detectors
- 12. Radioactive metalloid discovered by Curie
- 14. Used in neutron sources
- 18. Rare radioactive actinide
- 20. Named after Einstein
Down
- 1. Weakly radioactive actinide
- 3. Fuel for nuclear reactors
- 5. Synthetic actinide element
- 6. Synthetic actinide discovered in nuclear tests
- 7. Named after Marie Curie
- 9. Extremely rare, highly radioactive alkali metal
- 10. Fissile actinide used in reactors and weapons
- 13. Heavy, soft metal, symbol Pb
- 15. First transuranic element
- 16. Rare, radioactive halogen
- 17. Low-toxicity heavy metal with rainbow crystals
- 19. Radioactive alkaline earth discovered by Curie