Across
- 4. electron in the outermost shell
- 8. neither metals nor non-metals
- 10. the bonding between ions
- 11. short name of this element is O
- 12. center of our solar system
Down
- 1. covers most of earth's surface
- 2. positively charged ion
- 3. not a planet anymore :(
- 5. the bonding between two non-metals
- 6. average mass of an atom
- 7. isn't in the nucleus, but in shells around
- 9. negatively charged ion