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You may have incorrectly determined the charge on the negative ion, leading to wrong oxidation state for the metal.

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This compound contains a main group metal that forms more than one type of ion. A Roman numeral must be used in the name of this compound.

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Your choice indicates a polyatomic ion that is not found in this compound.

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The prefixes mono-, di-, tri-, tetra-, are used only with covalent compounds, and this compound is ionic.

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