What compound contains an ion with a 3 charge?

An example of a compound that contains an ion with a 3+ charge is aluminum oxide (Al₂O₃). In this compound, the aluminum ion (Al³⁺) has a +3 charge, while the oxide ion (O²⁻) has a -2 charge. The overall neutral charge of the compound is achieved by combining two aluminum ions with three oxide ions. Other examples include iron(III) chloride (FeCl₃), where the iron ion has a +3 charge.