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

# potassium

| Property | Value |
| --- | --- |
| Symbol | K |
| Atomic number | 19 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Potassium` |
| Wikidata | [Q703](https://www.wikidata.org/wiki/Q703) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 39.0983(1) | 1979 | [10.1351/pac198052102349](https://doi.org/10.1351/pac198052102349) | Current | [`AW-K-standard`](../id/AW-K-standard.md) |
| 39.0983(3) | 1975 | [10.1351/pac197647010075](https://doi.org/10.1351/pac197647010075) | Deprecated, see [`AW-K-standard`](../id/AW-K-standard.md) | [`AW-K-standard-1975`](../id/AW-K-standard-1975.md) |
| 39.098(3) | 1971 | [10.1351/pac197230030637](https://doi.org/10.1351/pac197230030637) | Deprecated, see [`AW-K-standard-1975`](../id/AW-K-standard-1975.md) | [`AW-K-standard-1971`](../id/AW-K-standard-1971.md) |
| 39.102(3) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-K-standard-1971`](../id/AW-K-standard-1971.md) | [`AW-K-standard-1969`](../id/AW-K-standard-1969.md) |
| 39.102 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-K-standard-1969`](../id/AW-K-standard-1969.md) | [`AW-K-standard-1961`](../id/AW-K-standard-1961.md) |
| 39.100 | 1951 | [10.1039/JR9530000001](https://doi.org/10.1039/JR9530000001) | Deprecated, see [`AW-K-standard-1961`](../id/AW-K-standard-1961.md) | [`AW-K-standard-1951`](../id/AW-K-standard-1951.md) |
| 39.096 | 1934 | [10.1039/JR9340000499](https://doi.org/10.1039/JR9340000499) | Deprecated, see [`AW-K-standard-1951`](../id/AW-K-standard-1951.md) | [`AW-K-standard-1934`](../id/AW-K-standard-1934.md) |
| 39.10 | 1931 | [10.1039/JR9310001617](https://doi.org/10.1039/JR9310001617) | Deprecated, see [`AW-K-standard-1934`](../id/AW-K-standard-1934.md) | [`AW-K-standard-1931`](../id/AW-K-standard-1931.md) |
| 39.096 | 1925 | [10.1039/CT9252700913](https://doi.org/10.1039/CT9252700913) | Deprecated, see [`AW-K-standard-1931`](../id/AW-K-standard-1931.md) | [`AW-K-standard-1925`](../id/AW-K-standard-1925.md) |
| 39.10 | 1909 | [10.1021/ja01931a001](https://doi.org/10.1021/ja01931a001) | Deprecated, see [`AW-K-standard-1925`](../id/AW-K-standard-1925.md) | [`AW-K-standard-1909`](../id/AW-K-standard-1909.md) |
| 39.15 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-K-standard-1909`](../id/AW-K-standard-1909.md) | [`AW-K-standard-1902`](../id/AW-K-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [39](../id/K-39.md) | 0.932 581(44) | — | — | [`Abundance-K39`](../id/Abundance-K39.md) | — | [Q2023226](https://www.wikidata.org/wiki/Q2023226) |
| [40](../id/K-40.md) | 0.000 117(1) | — | — | [`Abundance-K40`](../id/Abundance-K40.md) | — | [Q2251076](https://www.wikidata.org/wiki/Q2251076) |
| [41](../id/K-41.md) | 0.067 302(44) | — | — | [`Abundance-K41`](../id/Abundance-K41.md) | — | [Q2956910](https://www.wikidata.org/wiki/Q2956910) |

## Bibliography

<div class="csl-bib-body">
<div class="csl-entry">(1976). <i>Pure and Applied Chemistry</i>, <i>47</i>(1), 75–96. https://doi.org/10.1351/pac197647010075 <a href="https://doi.org/10.1351/pac197647010075">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac197647010075">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 1971. (1972). <i>Pure and Applied Chemistry</i>, <i>30</i>(3–4), 637–650. https://doi.org/10.1351/pac197230030637 <a href="https://doi.org/10.1351/pac197230030637">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac197230030637">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">Baxter, G. P., Curie, Mme. P., Lebeau, P., Hönigschmid, O., &#38; Meyer, R. J. (1934). Fourth Report of the Committee on Atomic Weights of the International Union of Chemistry. <i>J. Chem. Soc.</i>, <i>0</i>(0), 499–512. https://doi.org/10.1039/jr9340000499 <a href="https://doi.org/10.1039/JR9340000499">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/JR9340000499">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">International atomic weights, 1951. (1953). <i>Journal of the Chemical Society (Resumed)</i>, 1. https://doi.org/10.1039/jr9530000001 <a href="https://doi.org/10.1039/JR9530000001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/JR9530000001">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: [Potassium.ttl](Potassium.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-K-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-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:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.15 ] .

ciaaw_draft:AW-K-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1979"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1975 ;
    dcterms:source <https://doi.org/10.1351/pac198052102349> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.0983 ;
            qudt:standardUncertainty 0.0001 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-K-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1925 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.10 ] .

ciaaw_draft:AW-K-standard-1925 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1931 ;
    dcterms:issued "1925"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1909 ;
    dcterms:source <https://doi.org/10.1039/CT9252700913> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.096 ] .

ciaaw_draft:AW-K-standard-1931 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1934 ;
    dcterms:issued "1931"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1925 ;
    dcterms:source <https://doi.org/10.1039/JR9310001617> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.10 ] .

ciaaw_draft:AW-K-standard-1934 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1951 ;
    dcterms:issued "1934"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1931 ;
    dcterms:source <https://doi.org/10.1039/JR9340000499> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.096 ] .

ciaaw_draft:AW-K-standard-1951 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1961 ;
    dcterms:issued "1951"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1934 ;
    dcterms:source <https://doi.org/10.1039/JR9530000001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.100 ] .

ciaaw_draft:AW-K-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1951 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.102 ] .

ciaaw_draft:AW-K-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1971 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.102 ;
            qudt:standardUncertainty 0.003 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-K-standard-1971 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard-1975 ;
    dcterms:issued "1971"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac197230030637> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.098 ;
            qudt:standardUncertainty 0.003 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-K-standard-1975 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-K-standard ;
    dcterms:issued "1975"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-K-standard-1971 ;
    dcterms:source <https://doi.org/10.1351/pac197647010075> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Potassium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 39.0983 ;
            qudt:standardUncertainty 0.0003 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Potassium a chemrof:ChemicalElement ;
    rdfs:label "potassium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-K-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-K-standard,
        ciaaw_draft:AW-K-standard-1902,
        ciaaw_draft:AW-K-standard-1909,
        ciaaw_draft:AW-K-standard-1925,
        ciaaw_draft:AW-K-standard-1931,
        ciaaw_draft:AW-K-standard-1934,
        ciaaw_draft:AW-K-standard-1951,
        ciaaw_draft:AW-K-standard-1961,
        ciaaw_draft:AW-K-standard-1969,
        ciaaw_draft:AW-K-standard-1971,
        ciaaw_draft:AW-K-standard-1975 ;
    ciaaw:hasIsotope ciaaw_draft:K-39,
        ciaaw_draft:K-40,
        ciaaw_draft:K-41 ;
    ciaaw:standardAtomicWeightUncertainty 0.0001 ;
    ciaaw:standardAtomicWeightValue 39.0983 ;
    chemrof:atomic_number 19 ;
    chemrof:symbol "K" .
```

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