Answer
See answer below.
Work Step by Step
This problem requires familiarization with common cations and anions and their charges; there's not much that can be explained other than electron balancing is required (sum of the negative charges must be equal to the sum of the positive ones).
$\begin{smallmatrix}
Cation & Anion & Name & Formula \\
NH_4^+ & Br^- & ammonium\ bromide & NH_4Br \\
Ba^{2+} & S^{2-} & barium\ sulfide & BaS \\
Fe^{2+} & Cl^{-} & iron\ (||)\ chloride & FeCl_2 \\
Pb^{2+} & F^{-} & lead\ (||)\ fluoride & PbF_2 \\
Al^{3+} & CO_3^{2-} & aluminum\ carbonate & Al_2(CO_3)_2 \\
Fe^{3+} & O^{2-} & iron\ (|||)\ oxide & Fe_2O_3 \\
\end{smallmatrix}$
