Answer
$a) K_{3}P$
$b) CuCl_{2}$
$c) FeBr_{3}$
$d) MgO$
Work Step by Step
$a) K^{+} P^{3-} = K_{3}P$
$b) Cu^{2+} Cl^{-} = CuCl_{2}$
$c) Fe^{3+} Br^{-} = FeBr_{3}$
$d) Mg^{2+} O^{2-} = Mg^{+} O^{-} = MgO$
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