Across
- 2. The zinc group
- 4. Earth metals
- 5. used for fire alarms
- 7. 50 on the periodic table
- 9. the alkali metals
- 11. 30 on the periodic table
- 12. the symbol of C
- 15. 2 on the periodic table
- 17. 79 on the periodic table
- 18. above the Atomic symbol
- 19. 7 on the periodic table
Down
- 1. 78 on the periodic table
- 3. 98 on the periodic table
- 6. 22 on the periodic table
- 8. the symbol of fe
- 10. 3 on the periodic table
- 13. used for breathing and 8 on the periodic table
- 14. 47 on the periodic table
- 16. the ions