steps to name compounds with polyatomic ions
step 1: name the metal
step 2: name the polyatomic ion
1. ba(no₃)₂ =
2. li₂so₄ =
3. koh =
4. mgco₃=

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# Explanation:
## Step1: Name the metal
For $Ba(NO_3)_2$, the metal is barium ($Ba$). For $Li_2SO_4$, the metal is lithium ($Li$). For $KOH$, the metal is potassium ($K$). For $MgCO_3$, the metal is magnesium ($Mg$).
## Step2: Name the polyatomic ion
The polyatomic ion in $Ba(NO_3)_2$ is nitrate ($NO_3^-$). The polyatomic ion in $Li_2SO_4$ is sulfate ($SO_4^{2 -}$). The polyatomic ion in $KOH$ is hydroxide ($OH^-$). The polyatomic ion in $MgCO_3$ is carbonate ($CO_3^{2 -}$).

# Answer:
1. Barium nitrate
2. Lithium sulfate
3. Potassium hydroxide
4. Magnesium carbonate

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Question

Explanation:

Step1: Name the metal

Step2: Name the polyatomic ion

Answer: