Here's how we arrive at that:
* Gallium is a metal with a +3 charge (Ga³⁺).
* Carbonate is a polyatomic ion with a -2 charge (CO₃²⁻).
To balance the charges, we need two gallium ions (2 x +3 = +6) and three carbonate ions (3 x -2 = -6). This gives us the formula Ga₂(CO₃)₃.
