Identify the structural formula for magnesium hydroxide.

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Step 1: Determine the ions involved. Magnesium typically forms a $Mg^{2+}$ cation; hydroxide is $OH^{-}$.  
Step 2: Balance charges. To neutralize the $+2$ charge of one $Mg^{2+}$, two $OH^{-}$ ions are needed, since $2	imes(-1) = -2$.  
Step 3: Write the formula using parentheses for the polyatomic ion: $Mg(OH)_2$.  
Step 4: Match to the given options: option (4) is $Mg(OH)_2$, which corresponds to choice d.  
FINAL_ANSWER: d

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