Across
- 3. Group II
- 9. Group V
- 12. Group I
- 13. vertical columns
- 14. Horizontal rows
- 15. Remaining elements
- 17. Gases Group VIII
- 19. Group III
- 20. Group IV
Down
- 1. Right of metalloid line
- 2. Positively charged ion
- 4. Left of metalloid line
- 5. Group VII
- 6. Hg, Br
- 7. H, N, O, F, Cl, He, Ne, Ar, Kr, Xe, R
- 8. Created the first periodic table
- 10. Above and below the stairway and last one to the right of the stairs
- 11. 1, 2, 13-18
- 16. Group VI
- 18. An atom or group of atoms that has either gained or lost e- so that it is no longer