Across
- 2. – Noble gas
- 5. – Group 17 reactive nonmetals
- 7. – Path of an electron
- 8. – Noble gas
- 9. – SI unit for amount of substance
Down
- 1. – Charged atom or molecule
- 3. – Negatively charged subatomic particle
- 4. – Group of gases with full outer shells
- 6. – Smallest unit of matter