Across
- 3. column
- 4. 7A
- 5. 6.02 x 10E23
- 10. start of reaction
- 11. hard stuff
- 12. electrons
- 13. negative
- 15. positive
- 16. 1A
Down
- 1. 8A
- 2. electons lowest first
- 6. branch of science
- 7. hydrogen+carbon
- 8. row
- 9. hydroxide ions
- 14. no charge
- 15. ending
- 17. used first
- 18. hydrogen ions
- 19. has mass