Across
- 3. What particle is found in shells around the nucleus?
- 4. What type of bonding involves the sharing of electrons?
- 6. What particle has no charge?
- 7. What type of bonding involves the formation of ions?
Down
- 1. What element is the most reactive in Group 17?
- 2. What particle has a positive charge?
- 5. What alkalis metal is the least reactive?