Across
- 4. a kind of compound
- 6. different substances that can be physically separated
- 7. chemical symbols and proportions of chemical symbols
- 9. Fe + C, a kind of mixture
- 10. two or more elements that are chemically bonded
Down
- 1. building blocks
- 2. different atoms that are not chemically bonded
- 3. what holds compounds together
- 5. a kind of element needed to breathe
- 8. atoms of the same kind grouped together