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