Across
- 3. change
- 5. solid
- 7. formed substance
- 8. chemical
- 13. atom
- 15. scientific law
- 20. different
- 22. neutral
- 23. protons
- 24. increases
Down
- 1. number
- 2. combination
- 4. group atoms
- 6. total
- 9. substance
- 10. positive
- 11. reversible
- 12. more than one
- 14. negative
- 16. substance tree
- 17. same
- 18. time event
- 19. ATOM
- 21. present substance