Final answer:
The formula of the compound is Al2O3, containing two Al3+ ions and three O2- ions. the total number of positive charges on the cations must equal the total number of negative charges on the anions. Therefore, two ${Al}^{3+}$ ions are needed to balance the charge of three ${O}^{2-}$ ions.
Step-by-step explanation:
The formula for the ionic compound would be Al2O3. This is because the compound contains two ions with a charge of ${6}^+$ and ${2}^-$. In order for the compound to be electrically neutral, the total number of positive charges on the cations must equal the total number of negative charges on the anions. Therefore, two ${Al}^{3+}$ ions are needed to balance the charge of three ${O}^{2-}$ ions.
compound is Al2O3, containing two Al3+ ions and three O2- ions. the total number of positive charges on the cations must equal the total number of negative charges on the anions. Therefore, two ${Al}^{3+}$ ions are needed to balance the charge of three ${O}^{2-}$ ions.