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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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The charge per appearance of the negative ion is 1-. Use this to determine the oxidation number of the positive ion.

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You have incorrectly named the negative ion.

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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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