1.1. Explain the difference between the structure and the pH of sodium oxide and phosphorus (V) oxide.

1.2. The metallic oxides in Period 3 can react with some of the non-metal oxides in the same Period. 

i) Write an equation for the reaction between sodium oxide and phosphorus (V) oxide.

ii) Write an equation for the reaction between magnesium oxide and phosphorus (V) oxide.

1.3. Explain the pH values of sodium oxide and magnesium oxide when reacted with water.

1.4. Aluminium oxide is another metallic oxide of the Period 3 elements. Write an equation to show how this metallic oxide reacts in a different way to that of sodium oxide and magnesium oxide.