Across
- 4. Nature of oxide of Sodium ?
- 6. Element that only have 1st Ionisation Energy?
- 7. What element essential for building and maintaining healthy bones and teeth ?
- 9. The other name for group 17 ?
Down
- 1. A halogen in period 4 ?
- 2. Nature of oxide of Aluminium ?
- 3. MgO only can react with ?
- 5. _______ kill bacteria , it is used to treat drinking water and swimming pool water .
- 8. Sodium is _______ in water.