Across
- 1. a substance composed of two or more elements
- 6. two or more atoms bonded together
- 7. light or heat
- 8. substances you start with before the chemical reaction
- 9. ability to react with other elements
- 10. substances you end with after the chemical reaction
Down
- 2. anything that has a mass and takes up space
- 3. center of the atoms
- 4. make up all the matter in the universe
- 5. ability to reflect light
- 7. cloud outer layers of atoms