The compound formed between Fe³⁺ (iron (III)) and S²⁻ (sulfide) ions is called iron (III) sulfide. The chemical formula for this compound is Fe₂S₃.
To understand how we arrive at this formula, we need to consider the charges of the ions involved. The iron ion has a charge of +3, while the sulfide ion has a charge of -2. To create a neutral compound, we need to balance the total positive and negative charges.
We can determine the ratio of the ions needed to balance the charges. Since we need two Fe³⁺ ions (which provide a total charge of +6) to balance with three S²⁻ ions (which provide a total charge of -6), the resulting formula is Fe₂S₃. Thus, in summary, the name of the compound is iron (III) sulfide, and its formula is Fe₂S₃.