CHEMISTRY 5070 · STRUCTURED PRACTICE
The elements sodium to argon form Period 3 of the Periodic Table.
Explain why sodium and chlorine are placed in the same period of the Periodic Table.
State and explain the trend in atomic radius across Period 3 from sodium to chlorine.
The oxides of Period 3 elements show a transition in bonding and chemical character.
Identify the bonding type and physical structure in sodium oxide () and sulfur dioxide ().
Describe an experiment, using universal indicator solution, to distinguish between aqueous solutions of sodium oxide and sulfur dioxide, giving expected observations and pH values.
Silicon is a Period 3 element located in Group IV.
Describe the structure and bonding of silicon, explaining why it has a very high melting point (1414 °C).
State one practical electrical application of silicon due to its position on the metalloid boundary.
Total: 13 marks