* Identify the elements: Aluminum (Al) and Bromine (Br).
* Determine their charges: Aluminum forms a +3 ion (Al³⁺) and bromine forms a -1 ion (Br⁻).
* Balance the charges: To achieve a neutral compound, we need three bromide ions (3 x -1 = -3) to balance the +3 charge of the aluminum ion.
* Write the formula: The formula for aluminum bromide is AlBr₃.
