Periodic Table

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