Which of the following is the correct chemical formula for lead(II) bromide?

• A. Pb2Br2
• B. PbBr2
• C. Pb2Br
• D. PbBr

Answer: (B)

Verified step by step guidance

1. Identify the charge on the lead ion in lead(II) bromide. The (II) indicates that lead has a +2 charge, so the ion is Pb^{2+}.
2. Determine the charge on the bromide ion. Bromide is a halide ion with a charge of -1, so the ion is Br^{-}.
3. To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral.
4. Since Pb^{2+} has a +2 charge and Br^{-} has a -1 charge, you need two bromide ions to balance one lead ion, resulting in the formula PbBr_{2}.
5. Verify that the formula PbBr_{2} has a total charge of zero: (+2) + 2 (-1) = 0, confirming it is the correct chemical formula.