Iron ( $Fe$ , $Z = 26$ )

The chemical element with atomic number 26. Iron-group nuclear binding energy and silicon burning are central to the termination of ordinary energy-producing stellar fusion.

Iron wire

Iron(III) hydroxide ( $Fe (OH)_{3}$ )

The hydrated ferric precipitate conventionally represented as

Fe (OH)_{3}

in qualitative analysis; real precipitates need not consist of one uniquely defined pure hydroxide phase.

Iron(II) hydroxide ( $Fe (OH)_{2}$ )

The ferrous hydroxide material represented by

Fe (OH)_{2}

, which oxidizes on exposure to air.

Iron(II) sulfide ( $FeS$ )

The sulfide represented by

FeS

, used historically to generate hydrogen sulfide with dilute nonoxidizing chemical acids.

Iron compound

A chemical compound containing iron; the oxidation state and associated ligands distinguish medicinal preparations.

Iron phosphate

An iron phosphate; a precise description must state the oxidation state and hydration or mixed composition.

Iron(II) phosphate ( $F e_{3} (P O_{4})_{2}$ )

The ferrous phosphate. The historical official powder was partly oxidized.

Iron hydroxide

A family of iron hydroxide materials. Their precipitation can obscure colour tests unless the analytical sequence controls the pH.

Iron(III) ( $F e^{3 +}$ )

The +3 oxidation state of iron; the aqueous cation is commonly represented by

F e^{3 +}

.

Iron(III) sulfate ( $F e_{2} (S O_{4})_{3}$ )

The ferric sulfate, historically called persulphate of iron in pharmaceutical monographs.

Iron(III) nitrate ( $Fe (N O_{3})_{3}$ )

The ferric nitrate, historically called pernitrate of iron.

Iron(III) chloride ( $FeC l_{3}$ )

The ferric chloride, historically called perchloride of iron; it is not a perchlorate.

Iron(II) ( $F e^{2 +}$ )

The +2 oxidation state of iron; the aqueous cation is commonly represented by

F e^{2 +}

.

Iron(II) iodide ( $Fe I_{2}$ )

The ferrous iodide, supplied in historical solid, syrup and pill preparations.

Iron(II) carbonate ( $FeC O_{3}$ )

The ferrous carbonate, used in protected or freshly prepared historical formulations.

Iron(II) sulfate ( $FeS O_{4}$ )

The ferrous sulfate; the ordinary 1867 preparation is the heptahydrate.

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Iron by

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Iron is a chemical element with the symbol Fe (from the Latin "ferrum") and atomic number 26. It is a metal in the first transition series and is one of the most abundant elements in the universe, making up about 5% of the Earth's crust. Here are some key points about iron: 1. **Physical Properties**: Iron is a dense, malleable, ductile metal that has a silvery-gray appearance.

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Iron by

Ciro Santilli  40 Updated 2025-07-16

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