Across
- 4. number eleven on the periodic table
- 7. number three on the periodic table
- 8. number 17 on periodic table
- 11. number twelve on the periodic table
- 13. number one on the periodic table
- 15. number two on the periodic table
- 16. number nine on the periodic table
- 18. number ten on the periodic table
- 19. number 16 on the periodic table
Down
- 1. number 20
- 2. number five on the periodic table
- 3. number fourteen on the periodic table
- 5. number thirteen on the periodic table
- 6. number 19 on periodic table
- 8. number six on the periodic table
- 9. number four on the periodic table
- 10. number 18 on periodic table
- 12. number 15 on the periodic table
- 14. number eight on the periodic table
- 17. number seven on the periodic table