1. Identify the charges of the ions:
* Chromium (Cr) can form multiple ions, but we need to know its specific oxidation state. Let's assume we're working with chromium(III), which has a +3 charge (Cr³⁺).
* Chloride (Cl) is a halogen and typically forms an ion with a -1 charge (Cl⁻).
2. Determine the ratio of ions needed to achieve neutrality:
* To balance the +3 charge of chromium with the -1 charge of chloride, we need three chloride ions for every chromium ion.
3. Write the formula:
* The formula is written with the cation (positive ion) first and the anion (negative ion) second: CrCl₃
Therefore, the correct formula for the ionic compound formed between chromium(III) and chloride is CrCl₃.
