Across
- 2. 1st on group 10
- 5. first element in boron group
- 7. 8th on period 4
- 11. metal with 78 protons
- 12. Has 83 Protons
- 16. 4th on period 4
- 17. Third on period 3
- 18. Symbol of Ce
- 20. First element on table
Down
- 1. Gas with symbol of Ne
- 3. right of Iron on table
- 4. 63 protons in this element
- 6. has only 7 protons
- 8. symbol of No
- 9. Last on group 2
- 10. Symbol is Li
- 13. First element on group 17
- 14. has 11 protons
- 15. Symbol is Au
- 19. Symbol of Po