Answer
Its name is Magnesium bromate hexahydrate.
Work Step by Step
$Mg(BrO_{3})_{2}.6H_{2}O$ has its cation $Mg^{2+}$, its anion bromate $BrO_{3}^{-}$ and 6 (hexa) water molecules of hydration. Hence, its name is Magnesium bromate hexahydrate.
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