Across
- 4. negative
- 7. empty space,+
- 10. forms +1 ion
- 11. ends with OH
- 12. positive
- 14. multiple-charges
- 15. position and energy
- 16. forms +2
- 18. forms -1
Down
- 1. scientific knowledge
- 2. aq+aq-->s
- 3. starts with H
- 5. non-reactive
- 6. no charge
- 7. most groups are this
- 8. electrons on the last shell
- 9. negatively charged particle
- 13. produces salt and water
- 17. energy levels
- 19. proton+neutrons