Across
- 3. nitros
- 8. cyanic
- 11. carbonic
- 12. perchloric
- 14. formic
- 17. iodic
- 18. chrlous
- 19. sulfuric
- 20. permanganic
Down
- 1. periodic
- 2. metaphric
- 4. sulfrufours
- 5. oxalic
- 6. hypochros
- 7. nitric
- 9. bromic
- 10. chloric
- 13. idos
- 15. chromic
- 16. metaboric