Which of the following is the correct chemical formula for aluminum bromide?

• A. Al2Br6
• B. Al2Br3
• C. AlBr
• D. AlBr3

Answer: (D)

Verified step by step guidance

1. Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and bromide forms a -1 charge (Br^{-}).
2. To form a neutral compound, the total positive charge must balance the total negative charge.
3. Since aluminum has a +3 charge and bromide has a -1 charge, you need three bromide ions to balance one aluminum ion.
4. Write the chemical formula by combining one aluminum ion with three bromide ions, resulting in AlBr_{3}.
5. Verify that the formula is electrically neutral: (1 \times +3) + (3 \times -1) = 0, confirming AlBr_{3} is correct.