Across
- 1. when two+ atoms bond with one+ electron pairs
- 4. the amount of protons in an element
- 8. what goes into a reaction
- 11. a positively charged ion
- 12. a positive atom
Down
- 2. cannot be broken down or changed
- 3. a negatively charged ion
- 5. the quantity of matter
- 6. a negative atom
- 7. what comes out of a reaction
- 9. basic unit of chemistry
- 10. atom with no charge