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

# arsenic

| Property | Value |
| --- | --- |
| Symbol | As |
| Atomic number | 33 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Arsenic` |
| Wikidata | [Q871](https://www.wikidata.org/wiki/Q871) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 74.921 595(6) | 2013 | [10.1515/pac-2015-0305](https://doi.org/10.1515/pac-2015-0305) | Current | [`AW-As-standard`](../id/AW-As-standard.md) |
| 74.921 60(2) | 1995 | [10.1351/pac199668122339](https://doi.org/10.1351/pac199668122339) | Deprecated, see [`AW-As-standard`](../id/AW-As-standard.md) | [`AW-As-standard-1995`](../id/AW-As-standard-1995.md) |
| 74.921 59(2) | 1985 | [10.1351/pac198658121677](https://doi.org/10.1351/pac198658121677) | Deprecated, see [`AW-As-standard-1995`](../id/AW-As-standard-1995.md) | [`AW-As-standard-1985`](../id/AW-As-standard-1985.md) |
| 74.9216(1) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-As-standard-1985`](../id/AW-As-standard-1985.md) | [`AW-As-standard-1969`](../id/AW-As-standard-1969.md) |
| 74.9216 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-As-standard-1969`](../id/AW-As-standard-1969.md) | [`AW-As-standard-1961`](../id/AW-As-standard-1961.md) |
| 74.91 | 1934 | [10.1039/JR9340000499](https://doi.org/10.1039/JR9340000499) | Deprecated, see [`AW-As-standard-1961`](../id/AW-As-standard-1961.md) | [`AW-As-standard-1934`](../id/AW-As-standard-1934.md) |
| 74.93 | 1931 | [10.1039/JR9310001617](https://doi.org/10.1039/JR9310001617) | Deprecated, see [`AW-As-standard-1934`](../id/AW-As-standard-1934.md) | [`AW-As-standard-1931`](../id/AW-As-standard-1931.md) |
| 74.96 | 1910 | [10.1021/ja01919a001](https://doi.org/10.1021/ja01919a001) | Deprecated, see [`AW-As-standard-1931`](../id/AW-As-standard-1931.md) | [`AW-As-standard-1910`](../id/AW-As-standard-1910.md) |
| 75 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-As-standard-1910`](../id/AW-As-standard-1910.md) | [`AW-As-standard-1902`](../id/AW-As-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [75](../id/As-75.md) | 1 | — | — | [`Abundance-As75`](../id/Abundance-As75.md) | — | [Q4942137](https://www.wikidata.org/wiki/Q4942137) |

## Bibliography

<div class="csl-bib-body">
<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">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., 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">Coplen, T. B. (1996). Atomic weights of the elements 1995 (Technical Report). <i>Pure and Applied Chemistry</i>, <i>68</i>(12), 2339–2359. https://doi.org/10.1351/pac199668122339 <a href="https://doi.org/10.1351/pac199668122339">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac199668122339">Scholia</a></div>
<div class="csl-entry">Meija, J., Coplen, T. B., Berglund, M., Brand, W. A., De Bièvre, P., Gröning, M., Holden, N. E., Irrgeher, J., Loss, R. D., Walczyk, T., &#38; Prohaska, T. (2016). Atomic weights of the elements 2013 (IUPAC Technical Report). <i>Pure and Applied Chemistry</i>, <i>88</i>(3), 265–291. https://doi.org/10.1515/pac-2015-0305 <a href="https://doi.org/10.1515/pac-2015-0305">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1515/pac-2015-0305">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: [Arsenic.ttl](Arsenic.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-As-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-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:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 75.0 ] .

ciaaw_draft:AW-As-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "2013"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1995 ;
    dcterms:source <https://doi.org/10.1515/pac-2015-0305> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.921595 ;
            qudt:standardUncertainty 0.000006 ;
            ciaaw:significantFigures 8 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-As-standard-1910 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard-1931 ;
    dcterms:issued "1910"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01919a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.96 ] .

ciaaw_draft:AW-As-standard-1931 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard-1934 ;
    dcterms:issued "1931"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1910 ;
    dcterms:source <https://doi.org/10.1039/JR9310001617> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.93 ] .

ciaaw_draft:AW-As-standard-1934 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard-1961 ;
    dcterms:issued "1934"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1931 ;
    dcterms:source <https://doi.org/10.1039/JR9340000499> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.91 ] .

ciaaw_draft:AW-As-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1934 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.9216 ] .

ciaaw_draft:AW-As-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard-1985 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.9216 ;
            qudt:standardUncertainty 0.0001 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-As-standard-1985 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard-1995 ;
    dcterms:issued "1985"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198658121677> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.92159 ;
            qudt:standardUncertainty 0.00002 ;
            ciaaw:significantFigures 7 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-As-standard-1995 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-As-standard ;
    dcterms:issued "1995"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-As-standard-1985 ;
    dcterms:source <https://doi.org/10.1351/pac199668122339> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Arsenic ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 74.92160 ;
            qudt:standardUncertainty 0.00002 ;
            ciaaw:significantFigures 7 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Arsenic a chemrof:ChemicalElement ;
    rdfs:label "arsenic"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-As-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-As-standard,
        ciaaw_draft:AW-As-standard-1902,
        ciaaw_draft:AW-As-standard-1910,
        ciaaw_draft:AW-As-standard-1931,
        ciaaw_draft:AW-As-standard-1934,
        ciaaw_draft:AW-As-standard-1961,
        ciaaw_draft:AW-As-standard-1969,
        ciaaw_draft:AW-As-standard-1985,
        ciaaw_draft:AW-As-standard-1995 ;
    ciaaw:hasIsotope ciaaw_draft:As-75 ;
    ciaaw:standardAtomicWeightUncertainty 0.000006 ;
    ciaaw:standardAtomicWeightValue 74.921595 ;
    chemrof:atomic_number 33 ;
    chemrof:symbol "As" .
```

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