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What is the chemical formula for iron?

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Quick Answer

Iron has the chemical formula Fe from its Latin name, ferrum. Its atomic number is 26, and its molar mass is 55.845 grams per mole. It has a metallic gray color and is attracted to magnets. Iron is the second most-abundant metal on Earth.

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Full Answer

Iron is a reactive element and reacts with most acids. Chemical compounds of iron in oxidation state +2 are called ferrous compounds, and are reducing agents. Ferric compounds contain iron in oxidation state +3, and are oxidizing agents. Pure iron corrodes in damp air to form rust. However, carbon-containing alloys, such as stainless steel, do not rust in normal conditions.

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