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

# magnesium

| Property | Value |
| --- | --- |
| Symbol | Mg |
| Atomic number | 12 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Magnesium` |
| Wikidata | [Q660](https://www.wikidata.org/wiki/Q660) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| [24.304, 24.307] | 2011 | [10.1351/PAC-REP-13-03-02](https://doi.org/10.1351/PAC-REP-13-03-02) | Current | [`AW-Mg-standard`](../id/AW-Mg-standard.md) |
| 24.3050(6) | 1985 | [10.1351/pac198658121677](https://doi.org/10.1351/pac198658121677) | Deprecated, see [`AW-Mg-standard`](../id/AW-Mg-standard.md) | [`AW-Mg-standard-1985`](../id/AW-Mg-standard-1985.md) |
| 24.305(1) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-Mg-standard-1985`](../id/AW-Mg-standard-1985.md) | [`AW-Mg-standard-1969`](../id/AW-Mg-standard-1969.md) |
| 24.305 | 1967 | [10.1351/pac196918040569](https://doi.org/10.1351/pac196918040569) | Deprecated, see [`AW-Mg-standard-1969`](../id/AW-Mg-standard-1969.md) | [`AW-Mg-standard-1967`](../id/AW-Mg-standard-1967.md) |
| 24.312 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-Mg-standard-1967`](../id/AW-Mg-standard-1967.md) | [`AW-Mg-standard-1961`](../id/AW-Mg-standard-1961.md) |
| 24.32 | 1909 | [10.1021/ja01931a001](https://doi.org/10.1021/ja01931a001) | Deprecated, see [`AW-Mg-standard-1961`](../id/AW-Mg-standard-1961.md) | [`AW-Mg-standard-1909`](../id/AW-Mg-standard-1909.md) |
| 24.36 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-Mg-standard-1909`](../id/AW-Mg-standard-1909.md) | [`AW-Mg-standard-1902`](../id/AW-Mg-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [24](../id/Mg-24.md) | [0.7888, 0.7905] | — | — | [`Abundance-Mg24`](../id/Abundance-Mg24.md) | — | [Q2096096](https://www.wikidata.org/wiki/Q2096096) |
| [25](../id/Mg-25.md) | [0.099 88, 0.100 34] | — | — | [`Abundance-Mg25`](../id/Abundance-Mg25.md) | — | [Q2796325](https://www.wikidata.org/wiki/Q2796325) |
| [26](../id/Mg-26.md) | [0.1096, 0.1109] | — | — | [`Abundance-Mg26`](../id/Abundance-Mg26.md) | — | [Q13808814](https://www.wikidata.org/wiki/Q13808814) |

## Bibliography

<div class="csl-bib-body">
<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">Atomic weights of the elements 1985. (1986). <i>Pure and Applied Chemistry</i>, <i>58</i>(12), 1677–1692. https://doi.org/10.1351/pac198658121677 <a href="https://doi.org/10.1351/pac198658121677">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac198658121677">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">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 class="csl-entry">Wieser, M. E., Holden, N., Coplen, T. B., Böhlke, J. K., Berglund, M., Brand, W. A., De Bièvre, P., Gröning, M., Loss, R. D., Meija, J., Hirata, T., Prohaska, T., Schoenberg, R., O’Connor, G., Walczyk, T., Yoneda, S., &#38; Zhu, X.-K. (2013). Atomic weights of the elements 2011 (IUPAC Technical                     Report). <i>Pure and Applied Chemistry</i>, <i>85</i>(5), 1047–1078. https://doi.org/10.1351/pac-rep-13-03-02 <a href="https://doi.org/10.1351/PAC-REP-13-03-02">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/PAC-REP-13-03-02">Scholia</a></div>
</div>

## Turtle

This resource as a file: [Magnesium.ttl](Magnesium.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-Mg-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Mg-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:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 24.36 ] .

ciaaw_draft:AW-Mg-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "2011"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Mg-standard-1985 ;
    dcterms:source <https://doi.org/10.1351/PAC-REP-13-03-02> ;
    ciaaw:ofElement element:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:lowerBound 24.304 ;
            qudt:upperBound 24.307 ;
            ciaaw:significantFiguresLower 5 ;
            ciaaw:significantFiguresUpper 5 ] .

ciaaw_draft:AW-Mg-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Mg-standard-1961 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Mg-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 24.32 ] .

ciaaw_draft:AW-Mg-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Mg-standard-1967 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Mg-standard-1909 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 24.312 ] .

ciaaw_draft:AW-Mg-standard-1967 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Mg-standard-1969 ;
    dcterms:issued "1967"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Mg-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac196918040569> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 24.305 ] .

ciaaw_draft:AW-Mg-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Mg-standard-1985 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Mg-standard-1967 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 24.305 ;
            qudt:standardUncertainty 0.001 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Mg-standard-1985 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Mg-standard ;
    dcterms:issued "1985"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Mg-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198658121677> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Magnesium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 24.3050 ;
            qudt:standardUncertainty 0.0006 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Magnesium a chemrof:ChemicalElement ;
    rdfs:label "magnesium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Mg-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Mg-standard,
        ciaaw_draft:AW-Mg-standard-1902,
        ciaaw_draft:AW-Mg-standard-1909,
        ciaaw_draft:AW-Mg-standard-1961,
        ciaaw_draft:AW-Mg-standard-1967,
        ciaaw_draft:AW-Mg-standard-1969,
        ciaaw_draft:AW-Mg-standard-1985 ;
    ciaaw:hasIsotope ciaaw_draft:Mg-24,
        ciaaw_draft:Mg-25,
        ciaaw_draft:Mg-26 ;
    ciaaw:standardAtomicWeightLower 24.304 ;
    ciaaw:standardAtomicWeightUpper 24.307 ;
    chemrof:atomic_number 12 ;
    chemrof:symbol "Mg" .
```

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