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

# barium

| Property | Value |
| --- | --- |
| Symbol | Ba |
| Atomic number | 56 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Barium` |
| Wikidata | [Q1112](https://www.wikidata.org/wiki/Q1112) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 137.327(7) | 1985 | [10.1351/pac198658121677](https://doi.org/10.1351/pac198658121677) | Current | [`AW-Ba-standard`](../id/AW-Ba-standard.md) |
| 137.33(1) | 1975 | [10.1351/pac197647010075](https://doi.org/10.1351/pac197647010075) | Deprecated, see [`AW-Ba-standard`](../id/AW-Ba-standard.md) | [`AW-Ba-standard-1975`](../id/AW-Ba-standard-1975.md) |
| 137.34(3) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-Ba-standard-1975`](../id/AW-Ba-standard-1975.md) | [`AW-Ba-standard-1969`](../id/AW-Ba-standard-1969.md) |
| 137.34 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-Ba-standard-1969`](../id/AW-Ba-standard-1969.md) | [`AW-Ba-standard-1961`](../id/AW-Ba-standard-1961.md) |
| 137.36 | 1931 | [10.1039/JR9310001617](https://doi.org/10.1039/JR9310001617) | Deprecated, see [`AW-Ba-standard-1961`](../id/AW-Ba-standard-1961.md) | [`AW-Ba-standard-1931`](../id/AW-Ba-standard-1931.md) |
| 137.37 | 1909 | [10.1021/ja01931a001](https://doi.org/10.1021/ja01931a001) | Deprecated, see [`AW-Ba-standard-1931`](../id/AW-Ba-standard-1931.md) | [`AW-Ba-standard-1909`](../id/AW-Ba-standard-1909.md) |
| 137.4 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-Ba-standard-1909`](../id/AW-Ba-standard-1909.md) | [`AW-Ba-standard-1902`](../id/AW-Ba-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [130](../id/Ba-130.md) | 0.0011(1) | — | — | [`Abundance-Ba130`](../id/Abundance-Ba130.md) | — | [Q2574790](https://www.wikidata.org/wiki/Q2574790) |
| [132](../id/Ba-132.md) | 0.0010(1) | — | — | [`Abundance-Ba132`](../id/Abundance-Ba132.md) | — | [Q2752861](https://www.wikidata.org/wiki/Q2752861) |
| [134](../id/Ba-134.md) | 0.0242(15) | — | — | [`Abundance-Ba134`](../id/Abundance-Ba134.md) | — | [Q2538685](https://www.wikidata.org/wiki/Q2538685) |
| [135](../id/Ba-135.md) | 0.0659(10) | — | — | [`Abundance-Ba135`](../id/Abundance-Ba135.md) | — | [Q3192465](https://www.wikidata.org/wiki/Q3192465) |
| [136](../id/Ba-136.md) | 0.0785(24) | — | — | [`Abundance-Ba136`](../id/Abundance-Ba136.md) | — | [Q2449314](https://www.wikidata.org/wiki/Q2449314) |
| [137](../id/Ba-137.md) | 0.1123(23) | — | — | [`Abundance-Ba137`](../id/Abundance-Ba137.md) | — | [Q4734760](https://www.wikidata.org/wiki/Q4734760) |
| [138](../id/Ba-138.md) | 0.7170(29) | — | — | [`Abundance-Ba138`](../id/Abundance-Ba138.md) | — | [Q2409784](https://www.wikidata.org/wiki/Q2409784) |

## 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">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">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., 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>

## Turtle

This resource as a file: [Barium.ttl](Barium.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-Ba-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ba-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:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.4 ] .

ciaaw_draft:AW-Ba-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1985"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ba-standard-1975 ;
    dcterms:source <https://doi.org/10.1351/pac198658121677> ;
    ciaaw:ofElement element:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.327 ;
            qudt:standardUncertainty 0.007 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Ba-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ba-standard-1931 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ba-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.37 ] .

ciaaw_draft:AW-Ba-standard-1931 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ba-standard-1961 ;
    dcterms:issued "1931"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ba-standard-1909 ;
    dcterms:source <https://doi.org/10.1039/JR9310001617> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.36 ] .

ciaaw_draft:AW-Ba-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ba-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ba-standard-1931 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.34 ] .

ciaaw_draft:AW-Ba-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ba-standard-1975 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ba-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.34 ;
            qudt:standardUncertainty 0.03 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Ba-standard-1975 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ba-standard ;
    dcterms:issued "1975"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ba-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac197647010075> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Barium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 137.33 ;
            qudt:standardUncertainty 0.01 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Barium a chemrof:ChemicalElement ;
    rdfs:label "barium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Ba-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Ba-standard,
        ciaaw_draft:AW-Ba-standard-1902,
        ciaaw_draft:AW-Ba-standard-1909,
        ciaaw_draft:AW-Ba-standard-1931,
        ciaaw_draft:AW-Ba-standard-1961,
        ciaaw_draft:AW-Ba-standard-1969,
        ciaaw_draft:AW-Ba-standard-1975 ;
    ciaaw:hasIsotope ciaaw_draft:Ba-130,
        ciaaw_draft:Ba-132,
        ciaaw_draft:Ba-134,
        ciaaw_draft:Ba-135,
        ciaaw_draft:Ba-136,
        ciaaw_draft:Ba-137,
        ciaaw_draft:Ba-138 ;
    ciaaw:standardAtomicWeightUncertainty 0.007 ;
    ciaaw:standardAtomicWeightValue 137.327 ;
    chemrof:atomic_number 56 ;
    chemrof:symbol "Ba" .
```

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