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Chemical substance record

Iron

7439-89-6Fe55.845 g/mol
ElementChEBI source record

An iron group element atom that has atomic number 26. — ChEBI

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Identity & molecular properties

Source-linked values
CAS number7439-89-6ChEBI ↗
Molecular formulaFeChEBI ↗
Molar mass55.845 g/molChEBI ↗
Monoisotopic mass55.93494 DaChEBI ↗
Formal charge0ChEBI ↗
ChEBI identifierCHEBI:18248ChEBI ↗

Cross-source molecular data

PubChem
Molar mass55.84 g/molPubChem ↗
Exact mass55.934936 DaPubChem ↗

PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.

Names & structural identifiers

Copy any identifier
iron atom
iron
XEEYBQQBJWHFJM-UHFFFAOYSA-N
[Fe]
InChI=1S/Fe

Names & synonyms

iron

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

Roles recorded in ChEBI

micronutrientEscherichia coli metabolite

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass
Equivalent amount
0.0179067 mol

Uses 55.845 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions
Fe
Iron · 1 atom
100.00%

Calculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.

Research & patent references

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Sources & record history

Checked 27 Sep 2026
EMBL-EBI ChEBI · CHEBI:18248

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

NCBI PubChem · CID 23925 · retrieved 2026-09-27

PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.