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The key is understanding that compound charges come from the individual ions within them, and the overall charge must always balance to zero (or the stated charge). Start by identifying whether you're dealing with ionic or molecular compounds, then...
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How to approach this question
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Step 1: Identify the type of compound and separate it into its component ions
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Step 2: Use oxidation number rules and periodic table patterns to assign charges
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Step 3: Apply the charge balance principle to verify your answer