Across
- 4. at least two different types of atoms
- 5. 118 different types
- 6. main element of steel
- 8. how atoms are held together
- 9. no chemical bonds
Down
- 1. cannot be broken down into another substance gas
- 2. h20
- 3. Nacl
- 4. mixture
- 7. solid, liquid, or gas forms