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Which of the following is the correct chemical formula for aluminum oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the ionic compound FeO?
A
Iron(III) oxide
B
Ferrous oxide
C
Iron(II) oxide
D
Ferric oxide
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Identify the ions present in the compound FeO. Fe represents iron and O represents oxygen. Oxygen typically forms an oxide ion with a charge of 2-, written as O^{2-}.
Determine the charge on the iron ion in FeO. Since the compound is neutral overall, the charge on iron must balance the charge on oxygen. Because oxygen is 2-, iron must be 2+ to balance it, so the iron ion is Fe^{2+}.
Recall the naming conventions for iron ions: Fe^{2+} is called iron(II) or ferrous, and Fe^{3+} is called iron(III) or ferric.
Name the compound by combining the name of the metal with its oxidation state in Roman numerals in parentheses, followed by the name of the nonmetal with the suffix '-ide'. For FeO, this becomes iron(II) oxide.
Verify that the name matches the oxidation state and formula: since Fe is 2+ and O is 2-, the correct name for FeO is iron(II) oxide.
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