periodic table
Across
- 1. Oxygen
- 7. Magnesium
- 10. Vanadium
- 12. Chromium
- 13. Cerium
- 14. Copper
- 15. Californium
- 17. Hydrogen
Down
- 2. Germanium
- 3. Silver
- 4. Bromine
- 5. Rubidium
- 6. Calcium
- 8. Titanium
- 9. Carbon-Monoxide
- 11. Zinc
- 12. Cobalt
- 13. Carbon
- 16. Iron
- 18. Nickle