Final answer:
The compound composed of Cl- and Fe2+ ions is correctly named iron(II) chloride, with the Roman numeral (II) indicating the 2+ charge of the iron ion. Transition metals like iron require the charge to be specified in the compound's name due to their ability to form cations with variable charges.
Step-by-step explanation:
If an ionic compound is made of Cl- and Fe2+, the compound will be called Iron (II) chloride. Chloride ions always possess a 1- charge, so with two chloride ions together, we have a total negative charge of 2-. To balance this, the iron ion must have a 2+ charge. Therefore, the appropriate name for the compound is iron(II) chloride, with the Roman numeral (II) indicating the oxidation state or charge of the iron cation.
In chemistry, when naming Type II Ionic Compounds, such as those containing transition metals like iron, which can form cations with variable charges, the charge on the metal cation determines the numeral in the compound name. The correct naming convention in such scenarios is to include the charge of the metal ion as a Roman numeral in parentheses immediately following the name of the metal, as seen in iron(II) chloride. Without this distinction, the name would be ambiguous since iron can also form a 3+ cation, resulting in a different compound called iron(III) chloride.