Answer:
The compound composed of Cr³+ ions and SO32- ions is called chromium(III) sulfite.
The formula for this compound can be determined by balancing the charges of the Cr³+ ion and the SO32- ion so that the overall charge of the compound is neutral.
The charge of the Cr³+ ion is +3, while the charge of the SO32- ion is -2. To balance these charges, we need two SO32- ions for every Cr³+ ion:
Cr³+ + 2 SO32- → Cr2(SO3)3
Therefore, the formula for the compound is Cr2(SO3)3.