Which statement about the ions formed by the elements in Group VII of the Periodic Table is correct?

3.1.1. State the formulae of the elements and compounds named in the subject content

3.1.2. Define the molecular formula of a compound as the number and type of different atoms in one molecule

3.1.3. Deduce the formula of a simple compound from the relative numbers of atoms present in a model or a diagrammatic representation

3.1.4. Construct word equations and symbol equations to show how reactants form products, including state symbols

3.1.5. Define the empirical formula of a compound as the simplest whole number ratio of the different atoms or ions in a compound

3.1.6. Deduce the formula of an ionic compound from the relative numbers of the ions present in a model or a diagrammatic representation or from the charges on the ions

3.1.7. Construct symbol equations with state symbols, including ionic equations

3.1.8. Deduce the symbol equation with state symbols for a chemical reaction, given relevant information