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

# uranium

| Property | Value |
| --- | --- |
| Symbol | U |
| Atomic number | 92 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Uranium` |
| Wikidata | [Q1098](https://www.wikidata.org/wiki/Q1098) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 238.028 91(3) | 1999 | [10.1351/pac200173040667](https://doi.org/10.1351/pac200173040667) | Current | [`AW-U-standard`](../id/AW-U-standard.md) |
| 238.0289(1) | 1979 | [10.1351/pac198052102349](https://doi.org/10.1351/pac198052102349) | Deprecated, see [`AW-U-standard`](../id/AW-U-standard.md) | [`AW-U-standard-1979`](../id/AW-U-standard-1979.md) |
| 238.029(1) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-U-standard-1979`](../id/AW-U-standard-1979.md) | [`AW-U-standard-1969`](../id/AW-U-standard-1969.md) |
| 238.03 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-U-standard-1969`](../id/AW-U-standard-1969.md) | [`AW-U-standard-1961`](../id/AW-U-standard-1961.md) |
| 238.07 | 1937 | [10.1039/JR9370001900](https://doi.org/10.1039/JR9370001900) | Deprecated, see [`AW-U-standard-1961`](../id/AW-U-standard-1961.md) | [`AW-U-standard-1937`](../id/AW-U-standard-1937.md) |
| 238.14 | 1931 | [10.1039/JR9310001617](https://doi.org/10.1039/JR9310001617) | Deprecated, see [`AW-U-standard-1937`](../id/AW-U-standard-1937.md) | [`AW-U-standard-1931`](../id/AW-U-standard-1931.md) |
| 238.17 | 1925 | [10.1039/CT9252700913](https://doi.org/10.1039/CT9252700913) | Deprecated, see [`AW-U-standard-1931`](../id/AW-U-standard-1931.md) | [`AW-U-standard-1925`](../id/AW-U-standard-1925.md) |
| 238.2 | 1916 | [10.1021/ja02176a001](https://doi.org/10.1021/ja02176a001) | Deprecated, see [`AW-U-standard-1925`](../id/AW-U-standard-1925.md) | [`AW-U-standard-1916`](../id/AW-U-standard-1916.md) |
| 238.5 | 1903 | [10.1021/ja02003a001](https://doi.org/10.1021/ja02003a001) | Deprecated, see [`AW-U-standard-1916`](../id/AW-U-standard-1916.md) | [`AW-U-standard-1903`](../id/AW-U-standard-1903.md) |
| 239.5 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-U-standard-1903`](../id/AW-U-standard-1903.md) | [`AW-U-standard-1902`](../id/AW-U-standard-1902.md) |

Notes: [g](#note-g) [m](#note-m)

## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [234](../id/U-234.md) | 0.000 054(5) | — | — | [`Abundance-U234`](../id/Abundance-U234.md) | — | [Q2153640](https://www.wikidata.org/wiki/Q2153640) |
| [235](../id/U-235.md) | 0.007 204(6) | — | — | [`Abundance-U235`](../id/Abundance-U235.md) | — | [Q848497](https://www.wikidata.org/wiki/Q848497) |
| [238](../id/U-238.md) | 0.992 742(10) | — | — | [`Abundance-U238`](../id/Abundance-U238.md) | — | [Q1148503](https://www.wikidata.org/wiki/Q1148503) |

Notes: [g](#note-g) [m](#note-m)

## Notes

<a id="note-g"></a>**g** Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty.

<a id="note-m"></a>**m** Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the table can occur.

## Bibliography

<div class="csl-bib-body">
<div class="csl-entry">ANNUAL REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS, 1916. (1915). <i>Journal of the American Chemical Society</i>, <i>37</i>(11), 2449–2452. https://doi.org/10.1021/ja02176a001 <a href="https://doi.org/10.1021/ja02176a001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja02176a001">Scholia</a></div>
<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 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">Atomic Weights of the Elements 1979. (1980). <i>Pure and Applied Chemistry</i>, <i>52</i>(10), 2349–2384. https://doi.org/10.1351/pac198052102349 <a href="https://doi.org/10.1351/pac198052102349">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac198052102349">Scholia</a></div>
<div class="csl-entry">Baxter, G. P., Curie, Mme. M., Hönigschmid, O., Lebeau, P., &#38; Meyer, R. J. (1931). First Report of the Committee on the Atomic Weights of the International Union of Chemistry. <i>J. Chem. Soc.</i>, <i>0</i>(0), 1617–1627. https://doi.org/10.1039/jr9310001617 <a href="https://doi.org/10.1039/JR9310001617">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/JR9310001617">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. (1903). REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS. <i>Journal of the American Chemical Society</i>, <i>25</i>(1), 1–5. https://doi.org/10.1021/ja02003a001 <a href="https://doi.org/10.1021/ja02003a001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja02003a001">Scholia</a></div>
<div class="csl-entry">Coplen, T. B. (2001). Atomic weights of the elements 1999 (IUPAC Technical Report). <i>Pure and Applied Chemistry</i>, <i>73</i>(4), 667–683. https://doi.org/10.1351/pac200173040667 <a href="https://doi.org/10.1351/pac200173040667">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac200173040667">Scholia</a></div>
<div class="csl-entry">Hönigschmid, O., &#38; Lebeau, P. (1937). Seventh Report of the Committee on Atomic Weights of the International Union of Chemistry. <i>J. Chem. Soc.</i>, <i>0</i>(0), 1900–1909. https://doi.org/10.1039/jr9370001900 <a href="https://doi.org/10.1039/JR9370001900">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/JR9370001900">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: [Uranium.ttl](Uranium.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 skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

ciaaw:note-g a ciaaw:Footnote ;
    skos:definition "Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty."@en ;
    skos:notation "g" .

ciaaw:note-m a ciaaw:Footnote ;
    skos:definition "Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the table can occur."@en ;
    skos:notation "m" .

ciaaw_draft:AW-U-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1903 ;
    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:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 239.5 ] .

ciaaw_draft:AW-U-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1999"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1979 ;
    dcterms:source <https://doi.org/10.1351/pac200173040667> ;
    ciaaw:footnote ciaaw:note-g,
        ciaaw:note-m ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.02891 ;
            qudt:standardUncertainty 0.00003 ;
            ciaaw:significantFigures 8 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-U-standard-1903 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1916 ;
    dcterms:issued "1903"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja02003a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.5 ] .

ciaaw_draft:AW-U-standard-1916 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1925 ;
    dcterms:issued "1916"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1903 ;
    dcterms:source <https://doi.org/10.1021/ja02176a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.2 ] .

ciaaw_draft:AW-U-standard-1925 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1931 ;
    dcterms:issued "1925"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1916 ;
    dcterms:source <https://doi.org/10.1039/CT9252700913> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.17 ] .

ciaaw_draft:AW-U-standard-1931 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1937 ;
    dcterms:issued "1931"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1925 ;
    dcterms:source <https://doi.org/10.1039/JR9310001617> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.14 ] .

ciaaw_draft:AW-U-standard-1937 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1961 ;
    dcterms:issued "1937"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1931 ;
    dcterms:source <https://doi.org/10.1039/JR9370001900> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.07 ] .

ciaaw_draft:AW-U-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1937 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.03 ] .

ciaaw_draft:AW-U-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard-1979 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.029 ;
            qudt:standardUncertainty 0.001 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-U-standard-1979 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-U-standard ;
    dcterms:issued "1979"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-U-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198052102349> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Uranium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 238.0289 ;
            qudt:standardUncertainty 0.0001 ;
            ciaaw:significantFigures 7 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Uranium a chemrof:ChemicalElement ;
    rdfs:label "uranium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-U-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-U-standard,
        ciaaw_draft:AW-U-standard-1902,
        ciaaw_draft:AW-U-standard-1903,
        ciaaw_draft:AW-U-standard-1916,
        ciaaw_draft:AW-U-standard-1925,
        ciaaw_draft:AW-U-standard-1931,
        ciaaw_draft:AW-U-standard-1937,
        ciaaw_draft:AW-U-standard-1961,
        ciaaw_draft:AW-U-standard-1969,
        ciaaw_draft:AW-U-standard-1979 ;
    ciaaw:hasIsotope ciaaw_draft:U-234,
        ciaaw_draft:U-235,
        ciaaw_draft:U-238 ;
    ciaaw:standardAtomicWeightUncertainty 0.00003 ;
    ciaaw:standardAtomicWeightValue 238.02891 ;
    chemrof:atomic_number 92 ;
    chemrof:symbol "U" .
```

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