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

# chromium

| Property | Value |
| --- | --- |
| Symbol | Cr |
| Atomic number | 24 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Chromium` |
| Wikidata | [Q725](https://www.wikidata.org/wiki/Q725) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 51.9961(6) | 1983 | [10.1351/pac198456060653](https://doi.org/10.1351/pac198456060653) | Current | [`AW-Cr-standard`](../id/AW-Cr-standard.md) |
| 51.996(1) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-Cr-standard`](../id/AW-Cr-standard.md) | [`AW-Cr-standard-1969`](../id/AW-Cr-standard-1969.md) |
| 51.996 | 1967 | [10.1351/pac196918040569](https://doi.org/10.1351/pac196918040569) | Deprecated, see [`AW-Cr-standard-1969`](../id/AW-Cr-standard-1969.md) | [`AW-Cr-standard-1967`](../id/AW-Cr-standard-1967.md) |
| 51.996(1) | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-Cr-standard-1967`](../id/AW-Cr-standard-1967.md) | [`AW-Cr-standard-1961`](../id/AW-Cr-standard-1961.md) |
| 52.01 | 1925 | [10.1039/CT9252700913](https://doi.org/10.1039/CT9252700913) | Deprecated, see [`AW-Cr-standard-1961`](../id/AW-Cr-standard-1961.md) | [`AW-Cr-standard-1925`](../id/AW-Cr-standard-1925.md) |
| 52 | 1910 | [10.1021/ja01919a001](https://doi.org/10.1021/ja01919a001) | Deprecated, see [`AW-Cr-standard-1925`](../id/AW-Cr-standard-1925.md) | [`AW-Cr-standard-1910`](../id/AW-Cr-standard-1910.md) |
| 52.1 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-Cr-standard-1910`](../id/AW-Cr-standard-1910.md) | [`AW-Cr-standard-1902`](../id/AW-Cr-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [50](../id/Cr-50.md) | 0.043 45(13) | — | — | [`Abundance-Cr50`](../id/Abundance-Cr50.md) | — | [Q2424589](https://www.wikidata.org/wiki/Q2424589) |
| [52](../id/Cr-52.md) | 0.837 89(18) | — | — | [`Abundance-Cr52`](../id/Abundance-Cr52.md) | — | [Q4469260](https://www.wikidata.org/wiki/Q4469260) |
| [53](../id/Cr-53.md) | 0.095 01(17) | — | — | [`Abundance-Cr53`](../id/Abundance-Cr53.md) | — | [Q13466446](https://www.wikidata.org/wiki/Q13466446) |
| [54](../id/Cr-54.md) | 0.023 65(7) | — | — | [`Abundance-Cr54`](../id/Abundance-Cr54.md) | — | [Q2239560](https://www.wikidata.org/wiki/Q2239560) |

## Bibliography

<div class="csl-bib-body">
<div class="csl-entry">Aston, F. W., Baxter, G. P., Brauner, B., Debierne, A., Leduc, A., Richards, T. W., Soddy, F., &#38; Urbain, G. (1925). Second Report of the International Committee of the International Union of Pure and Applied Chemistry on the chemical elements. International atomic weights, 1925. <i>Journal of the Chemical Society, Transactions</i>, <i>127</i>, 913. https://doi.org/10.1039/ct9252700913 <a href="https://doi.org/10.1039/CT9252700913">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/CT9252700913">Scholia</a></div>
<div class="csl-entry">Atomic Weights of Elements. (1969). <i>Pure and Applied Chemistry</i>, <i>18</i>(4), 569–580. https://doi.org/10.1351/pac196918040569 <a href="https://doi.org/10.1351/pac196918040569">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac196918040569">Scholia</a></div>
<div class="csl-entry">Atomic weights of the elements 1969. (1970). <i>Pure and Applied Chemistry</i>, <i>21</i>(1), 91–108. https://doi.org/10.1351/pac197021010091 <a href="https://doi.org/10.1351/pac197021010091">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac197021010091">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., Thorpe, T. E., Ostwald, W., &#38; Urbain, G. (1910). REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS, 1910. <i>Journal of the American Chemical Society</i>, <i>32</i>(1), 1–4. https://doi.org/10.1021/ja01919a001 <a href="https://doi.org/10.1021/ja01919a001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja01919a001">Scholia</a></div>
<div class="csl-entry">Holden, N. E., &#38; Martin, R. L. (1984). Atomic weights of the elements 1983. <i>Pure and Applied Chemistry</i>, <i>56</i>(6), 653–674. https://doi.org/10.1351/pac198456060653 <a href="https://doi.org/10.1351/pac198456060653">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac198456060653">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: [Chromium.ttl](Chromium.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-Cr-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Cr-standard-1910 ;
    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:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 52.1 ] .

ciaaw_draft:AW-Cr-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1983"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Cr-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198456060653> ;
    ciaaw:ofElement element:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 51.9961 ;
            qudt:standardUncertainty 0.0006 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Cr-standard-1910 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Cr-standard-1925 ;
    dcterms:issued "1910"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Cr-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01919a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 52.0 ] .

ciaaw_draft:AW-Cr-standard-1925 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Cr-standard-1961 ;
    dcterms:issued "1925"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Cr-standard-1910 ;
    dcterms:source <https://doi.org/10.1039/CT9252700913> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 52.01 ] .

ciaaw_draft:AW-Cr-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Cr-standard-1967 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Cr-standard-1925 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 51.996 ;
            qudt:standardUncertainty 0.001 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Cr-standard-1967 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Cr-standard-1969 ;
    dcterms:issued "1967"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Cr-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac196918040569> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 51.996 ] .

ciaaw_draft:AW-Cr-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Cr-standard ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Cr-standard-1967 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Chromium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 51.996 ;
            qudt:standardUncertainty 0.001 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Chromium a chemrof:ChemicalElement ;
    rdfs:label "chromium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Cr-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Cr-standard,
        ciaaw_draft:AW-Cr-standard-1902,
        ciaaw_draft:AW-Cr-standard-1910,
        ciaaw_draft:AW-Cr-standard-1925,
        ciaaw_draft:AW-Cr-standard-1961,
        ciaaw_draft:AW-Cr-standard-1967,
        ciaaw_draft:AW-Cr-standard-1969 ;
    ciaaw:hasIsotope ciaaw_draft:Cr-50,
        ciaaw_draft:Cr-52,
        ciaaw_draft:Cr-53,
        ciaaw_draft:Cr-54 ;
    ciaaw:standardAtomicWeightUncertainty 0.0006 ;
    ciaaw:standardAtomicWeightValue 51.9961 ;
    chemrof:atomic_number 24 ;
    chemrof:symbol "Cr" .
```

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