What is the chemical formula for iron sulfide?


Quick Answer

The chemical formula of iron (II) sulfide is FeS. Because iron sulfide is a chemical compound made from iron bonded to sulfur, the chemical formula is made from a combination of their chemical symbols from the periodic table.

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Full Answer

Chemical formulas are based on the properties of the compounds they symbolize. In this case, iron cations are bonded to sulfur anions. A cation is an ion that has fewer electrons than protons, leaving it with a positive charge. An anion is an ion with more electrons than protons, leaving it with a negative charge. The iron has two fewer electrons than it needs to be stable, and the sulfur has two more electrons than it needs, so they bond to create a stable compound. Because there are equal amounts of iron and sulfur, they have assumed subscripts of 1 in the chemical formula. The cation always comes before the anion when naming an ionic compound.

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