Across
- 3. electron
- 4. sequence of actions
- 6. occupies space
- 8. substance
- 12. substance
- 14. testing of theories
- 16. chemical element
- 17. method or procedure
- 18. odourless gas
- 22. element
- 23. subatomic particle
- 24. region of space
Down
- 1. Greek philosopher
- 2. same elements
- 5. object or system
- 6. experimentation
- 7. neutron
- 9. mathematical expression
- 10. core of an atom
- 11. atom or molecule
- 13. smallest particle
- 15. property of matter
- 19. subatomic particle
- 20. atoms bonded
- 21. gold foil experiment