Across
- 2. atomic number
- 4. metals
- 6. anion
- 10. neutrons
- 12. protons
- 14. nonmetals
- 17. periodic table
- 18. alkali metals
- 19. mixture
- 20. hydrogen
Down
- 1. states of matter
- 3. oxidation
- 5. structure
- 7. plasma
- 8. atoms
- 9. sublimation
- 11. monoatomic
- 13. chemical
- 15. liquid
- 16. electronegativity