Across
- 4. Another word for a chemical change
- 5. Two or more atoms chemically joined together
- 6. Positively charged particles (plural) in the nucleus
- 8. Smallest unit of an element that keeps its properties
- 11. Negative (–) particle that moves around the center
- 12. Tiny building blocks that make up molecules (plural)
- 14. Neutral particle in the atom’s center
- 16. Particles with no charge (plural) in the nucleus
- 19. Lightest element; part of water
Down
- 1. New materials made by a chemical change
- 2. Formula for something we drinks
- 3. Negatively charged particles (plural) in atoms
- 4. Starting materials in a chemical change
- 7. Gas needed for burning and by your cells (formula O₂)
- 9. Positive (+) particle in the atom’s center
- 10. Common liquid with formula H₂O
- 13. The center of an atom with protons and neutrons
- 15. The link that holds atoms together
- 17. Formula for the gas we breathe
- 18. Gas exhaled by humans formula