Across
- 2. 9 on the periodic table
- 4. 20 on the periodic table
- 6. Fe on the periodic table
- 7. Ar on the periodic table
- 13. electrons Tell you what group number it is
- 15. K on the periodic table
- 18. vertical elements on the periodic table
- 19. Helium´s group.
- 20. metals The group numbers are in the middle.
Down
- 1. The first element on the periodic table
- 3. 5 on the periodic table
- 5. metals Hydrogen´s group
- 8. Horizontal elements on the periodic table
- 9. 13 on the periodic table
- 10. O on the periodic table
- 11. group 7
- 12. 3 on the periodic table
- 14. Things on the periodic table
- 16. 11 on the periodic table
- 17. 79 on the periodic table