Across
- 2. State of matter which particles are far apart and move quickly
- 4. The center of an atom
- 6. Cannot be broken down into a simpler form
- 8. Made of two or more different atoms that cannot be broken down easily
- 12. The point where a liquid becomes a gas
- 13. Inside the nucleus, does not have an electric charge
- 14. State of matter which is not solid or gas
- 15. Two or more substances that are not chemically combined
Down
- 1. On the outer most shell of an atom
- 3. State of matter in which the particles are slow and compact
- 5. Determines reactivity of an atom
- 7. A substance that can be dissolved
- 9. A table that lists and groups the elements
- 10. Used to identify an atom
- 11. Unit that measures the mass of an atom