The formula unit for the ionic compound, iron(II) sulfide, consists of which of the following?

Question

? 2 Fe3+ ions and 3 S2- ions
? 1 Fe2+ ion and 1 S2- ion
? 1 Fe2+ ion and 2 S- ions
? 1 Fe3+ ion and 3 S- ions
? 1 Fe+ ion and 1 S- ion

Answer 1

The formula unit for iron(II) sulfide is represented as \( \text{FeS} \). This indicates that the compound consists of 1 iron ion (\( \text{Fe}^{2+} \)) and 1 sulfide ion (\( \text{S}^{2-} \)). Therefore, the correct option is:

• 1 Fe²⁺ ion and 1 S²⁻ ion.