Across
- 2. / positive-charge particle
- 4. / repeating pattern layout
- 7. / negative-charge particle
- 9. / unlikely to change
- 10. / electron probability zones
- 11. / pure atomic substance
- 14. / atom with gained/lost electrons
- 15. / atoms joining together
- 16. / starting chemical material
- 19. / element with varied neutrons
- 21. / anything with mass
- 22. / mix of elements
- 25. / likely to react
- 27. / tiny energy unit
- 28. / outer electron number
Down
- 1. / small matter piece
- 3. / bonded atom group
- 5. / energy moving waves
- 6. / atom splitting apart
- 7. / ability to do work
- 8. / ending chemical material
- 12. Number / total protons + neutrons
- 13. / dense atomic center
- 17. / electrical property
- 18. / electron energy level
- 20. / electron movement path
- 23. / amount of matter
- 24. / no-charge particle
- 26. / force joining atoms
- 29. / smallest matter unit