Cool Chemistry Crossword
Across
- 3. K
- 5. an element with 1 proton
- 6. Fe
- 8. He
- 9. particles with negative charge
- 11. elements that are organized by reactivity
- 13. the model used to illustrate atoms
- 15. H
- 18. Xe
- 19. Na
Down
- 1. Ca
- 2. Ne
- 4. Ag
- 5. a name for group 17
- 7. Au
- 10. atomic mass - protons
- 12. S
- 14. particles with positive charge
- 16. another term for periods
- 17. He