Final answer:
The formula unit for the compound formed when X³⁺ and Y⁻ ions interact is XYZ.
Step-by-step explanation:
The formula unit for the compound formed when X³⁺ and Y⁻ ions interact is XYZ.
In this case, the X³⁺ ion and Y⁻ ion combine in a way that the charges balance out. The formula unit represents the simplest whole number ratio of ions in the compound. For example, if X³⁺ represents a cation with a charge of 3+ and Y⁻ represents an anion with a charge of 1-, then the simplest ratio of cations to anions would be 1:3.
Therefore, the formula unit for the compound formed when X³⁺ and Y⁻ interact is XYZ.