• equation for phosphorus (V) oxide and water and suggest a pH for the solution formed (2 marks)
• Explain, in terms of crystal structure and bonding, why silicon(IV) oxide has a higher melting point than phosphorus(V) oxide (4 marks)
• There is a general trend for an increase in ionisation energy across Period 3. Give 1 example of an element that deviates from this trend (3 marks)
• Give an equation, including state symbols, to represent the process that occurs when the third ionisation energy of sodium is measured (1 mark)
• explain how metals conduct electricity (2 marks)
• describe the bonding in metals (2 marks)
• Identify the s-block metal that has the highest first ionisation energy