At room temperature, solid iodine has a lattice structure. Describe how the iodine molecules are arranged inside the solid.
List every force of attraction in solid iodine, and indicate which ones are overcome when solid iodine is heated to form iodine vapour.
When iodine reacts with aluminium, a white solid, $\text{Al}_2\text{I}_6$, is formed. The diagram shows how the outer electrons are arranged in one molecule of $\text{Al}_2\text{I}_6$. How many co-ordinate (dative covalent) bonds are formed as a molecule of $\text{Al}_2\text{I}_6$ is built from its atoms?
Describe how co-ordinate (dative covalent) bonds are formed in this molecule.
When hydrogen iodide reacts with concentrated sulfuric acid, hydrogen sulfide, sulfur, iodine and water are formed. Write an equation for this reaction. You may find oxidation numbers useful.
Explain, using oxidation numbers, why this reaction is a redox reaction.