> **PROTOTYPE:** a suggestion, not an official CIAAW or IUPAC page. Official values are at [ciaaw.org](https://ciaaw.org).

# iron

| Property | Value |
| --- | --- |
| Symbol | Fe |
| Atomic number | 26 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Iron` |
| Wikidata | [Q677](https://www.wikidata.org/wiki/Q677) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 55.845(2) | 1993 | [10.1351/pac199466122423](https://doi.org/10.1351/pac199466122423) | Current | [`AW-Fe-standard`](../id/AW-Fe-standard.md) |
| 55.847(3) | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-Fe-standard`](../id/AW-Fe-standard.md) | [`AW-Fe-standard-1961`](../id/AW-Fe-standard-1961.md) |
| 55.85 | 1940 | [10.1039/JR9400000475](https://doi.org/10.1039/JR9400000475) | Deprecated, see [`AW-Fe-standard-1961`](../id/AW-Fe-standard-1961.md) | [`AW-Fe-standard-1940`](../id/AW-Fe-standard-1940.md) |
| 55.84 | 1912 | [10.1021/ja02224a601](https://doi.org/10.1021/ja02224a601) | Deprecated, see [`AW-Fe-standard-1940`](../id/AW-Fe-standard-1940.md) | [`AW-Fe-standard-1912`](../id/AW-Fe-standard-1912.md) |
| 55.85 | 1909 | [10.1021/ja01931a001](https://doi.org/10.1021/ja01931a001) | Deprecated, see [`AW-Fe-standard-1912`](../id/AW-Fe-standard-1912.md) | [`AW-Fe-standard-1909`](../id/AW-Fe-standard-1909.md) |
| 55.9 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-Fe-standard-1909`](../id/AW-Fe-standard-1909.md) | [`AW-Fe-standard-1902`](../id/AW-Fe-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [54](../id/Fe-54.md) | 0.058 45(105) | — | — | [`Abundance-Fe54`](../id/Abundance-Fe54.md) | — | [Q2696892](https://www.wikidata.org/wiki/Q2696892) |
| [56](../id/Fe-56.md) | 0.917 54(106) | — | — | [`Abundance-Fe56`](../id/Abundance-Fe56.md) | — | [Q1052454](https://www.wikidata.org/wiki/Q1052454) |
| [57](../id/Fe-57.md) | 0.021 19(29) | — | — | [`Abundance-Fe57`](../id/Abundance-Fe57.md) | — | [Q14744877](https://www.wikidata.org/wiki/Q14744877) |
| [58](../id/Fe-58.md) | 0.002 82(12) | — | — | [`Abundance-Fe58`](../id/Abundance-Fe58.md) | — | [Q2704780](https://www.wikidata.org/wiki/Q2704780) |

## Bibliography

<div class="csl-bib-body">
<div class="csl-entry">(1994). <i>Pure and Applied Chemistry</i>, <i>66</i>(12), 2423–2444. https://doi.org/10.1351/pac199466122423 <a href="https://doi.org/10.1351/pac199466122423">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac199466122423">Scholia</a></div>
<div class="csl-entry">Baxter, G. P., Guichard, M., Hönigschmid, O., &#38; Whytlaw-Gray, R. (1940). Tenth Report of the Committee on Atomic Weights of the International Union of Chemistry. <i>J. Chem. Soc.</i>, <i>0</i>(0), 475–478. https://doi.org/10.1039/jr9400000475 <a href="https://doi.org/10.1039/JR9400000475">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/JR9400000475">Scholia</a></div>
<div class="csl-entry">Cameron, A. E., &#38; Wichers, Edward. (1962). <b>Report of the International Commission on Atomic Weights<sup>*</sup>(1961)</b>. <i>Journal of the American Chemical Society</i>, <i>84</i>(22), 4175–4197. https://doi.org/10.1021/ja00881a001 <a href="https://doi.org/10.1021/ja00881a001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja00881a001">Scholia</a></div>
<div class="csl-entry">Clarke, F. W., Ostwald, W., Thorpe, T. E., &#38; Urbain, G. (1909). REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS. 1909. <i>Journal of the American Chemical Society</i>, <i>31</i>(1), 1–6. https://doi.org/10.1021/ja01931a001 <a href="https://doi.org/10.1021/ja01931a001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja01931a001">Scholia</a></div>
<div class="csl-entry">Clarke, F., Thorpe, T., Ostwald, W., &#38; Urbain, G. (1911). Annual Report of the International Committee on Atomic Weights, 1912. <i>Journal of the American Chemical Society</i>, <i>33</i>(11), 1639–1642. https://doi.org/10.1021/ja02224a601 <a href="https://doi.org/10.1021/ja02224a601">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja02224a601">Scholia</a></div>
<div class="csl-entry">Richards, Baxter, Hinrichsen, Köthner, P., &#38; Pellini, S. (1902). Zur Festsetzung der Atomgewichte. <i>Fresenius’ Zeitschrift für analytische Chemie</i>, <i>41</i>(2), 139–140. https://doi.org/10.1007/bf01370337 <a href="https://doi.org/10.1007/BF01370337">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1007/BF01370337">Scholia</a></div>
</div>

## Turtle

This resource as a file: [Iron.ttl](Iron.ttl)

```turtle
# Prototype: a suggestion, not an official CIAAW or IUPAC record. Official values are at https://ciaaw.org

@prefix adms: <http://www.w3.org/ns/adms#> .
@prefix chemrof: <https://w3id.org/chemrof/> .
@prefix ciaaw: <https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/ciaaw-draft#> .
@prefix ciaaw_draft: <https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/id/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix element: <https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

ciaaw_draft:AW-Fe-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Fe-standard-1909 ;
    dcterms:issued "1902"^^xsd:gYear ;
    dcterms:source <https://doi.org/10.1007/BF01370337> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Iron ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 55.9 ] .

ciaaw_draft:AW-Fe-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1993"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Fe-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac199466122423> ;
    ciaaw:ofElement element:Iron ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 55.845 ;
            qudt:standardUncertainty 0.002 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Fe-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Fe-standard-1912 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Fe-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Iron ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 55.85 ] .

ciaaw_draft:AW-Fe-standard-1912 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Fe-standard-1940 ;
    dcterms:issued "1912"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Fe-standard-1909 ;
    dcterms:source <https://doi.org/10.1021/ja02224a601> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Iron ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 55.84 ] .

ciaaw_draft:AW-Fe-standard-1940 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Fe-standard-1961 ;
    dcterms:issued "1940"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Fe-standard-1912 ;
    dcterms:source <https://doi.org/10.1039/JR9400000475> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Iron ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 55.85 ] .

ciaaw_draft:AW-Fe-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Fe-standard ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Fe-standard-1940 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Iron ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 55.847 ;
            qudt:standardUncertainty 0.003 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Iron a chemrof:ChemicalElement ;
    rdfs:label "iron"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Fe-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Fe-standard,
        ciaaw_draft:AW-Fe-standard-1902,
        ciaaw_draft:AW-Fe-standard-1909,
        ciaaw_draft:AW-Fe-standard-1912,
        ciaaw_draft:AW-Fe-standard-1940,
        ciaaw_draft:AW-Fe-standard-1961 ;
    ciaaw:hasIsotope ciaaw_draft:Fe-54,
        ciaaw_draft:Fe-56,
        ciaaw_draft:Fe-57,
        ciaaw_draft:Fe-58 ;
    ciaaw:standardAtomicWeightUncertainty 0.002 ;
    ciaaw:standardAtomicWeightValue 55.845 ;
    chemrof:atomic_number 26 ;
    chemrof:symbol "Fe" .
```

[All atomic weights](../atomic-weights.md) · [All isotopic abundances](../isotopic-abundances.md)