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

# thallium

| Property | Value |
| --- | --- |
| Symbol | Tl |
| Atomic number | 81 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Thallium` |
| Wikidata | [Q932](https://www.wikidata.org/wiki/Q932) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| [204.382, 204.385] | 2009 | [10.1351/PAC-REP-10-09-14](https://doi.org/10.1351/PAC-REP-10-09-14) | Current | [`AW-Tl-standard`](../id/AW-Tl-standard.md) |
| 204.3833(2) | 1985 | [10.1351/pac198658121677](https://doi.org/10.1351/pac198658121677) | Deprecated, see [`AW-Tl-standard`](../id/AW-Tl-standard.md) | [`AW-Tl-standard-1985`](../id/AW-Tl-standard-1985.md) |
| 204.383(1) | 1979 | [10.1351/pac198052102349](https://doi.org/10.1351/pac198052102349) | Deprecated, see [`AW-Tl-standard-1985`](../id/AW-Tl-standard-1985.md) | [`AW-Tl-standard-1979`](../id/AW-Tl-standard-1979.md) |
| 204.37(3) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-Tl-standard-1979`](../id/AW-Tl-standard-1979.md) | [`AW-Tl-standard-1969`](../id/AW-Tl-standard-1969.md) |
| 204.37 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-Tl-standard-1969`](../id/AW-Tl-standard-1969.md) | [`AW-Tl-standard-1961`](../id/AW-Tl-standard-1961.md) |
| 204.39 | 1925 | [10.1039/CT9252700913](https://doi.org/10.1039/CT9252700913) | Deprecated, see [`AW-Tl-standard-1961`](../id/AW-Tl-standard-1961.md) | [`AW-Tl-standard-1925`](../id/AW-Tl-standard-1925.md) |
| 204 | 1909 | [10.1021/ja01931a001](https://doi.org/10.1021/ja01931a001) | Deprecated, see [`AW-Tl-standard-1925`](../id/AW-Tl-standard-1925.md) | [`AW-Tl-standard-1909`](../id/AW-Tl-standard-1909.md) |
| 204.1 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-Tl-standard-1909`](../id/AW-Tl-standard-1909.md) | [`AW-Tl-standard-1902`](../id/AW-Tl-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [203](../id/Tl-203.md) | [0.2944, 0.2959] | — | — | [`Abundance-Tl203`](../id/Abundance-Tl203.md) | — | [Q18883327](https://www.wikidata.org/wiki/Q18883327) |
| [205](../id/Tl-205.md) | [0.7041, 0.7056] | — | — | [`Abundance-Tl205`](../id/Abundance-Tl205.md) | — | [Q18883334](https://www.wikidata.org/wiki/Q18883334) |

## Bibliography

<div class="csl-bib-body">
<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">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., &#38; Coplen, T. B. (2010). Atomic weights of the elements 2009 (IUPAC Technical Report). <i>Pure and Applied Chemistry</i>, <i>83</i>(2), 359–396. https://doi.org/10.1351/pac-rep-10-09-14 <a href="https://doi.org/10.1351/PAC-REP-10-09-14">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/PAC-REP-10-09-14">Scholia</a></div>
</div>

## Turtle

This resource as a file: [Thallium.ttl](Thallium.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-Tl-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-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:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.1 ] .

ciaaw_draft:AW-Tl-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "2009"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1985 ;
    dcterms:source <https://doi.org/10.1351/PAC-REP-10-09-14> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:lowerBound 204.382 ;
            qudt:upperBound 204.385 ;
            ciaaw:significantFiguresLower 6 ;
            ciaaw:significantFiguresUpper 6 ] .

ciaaw_draft:AW-Tl-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-standard-1925 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.0 ] .

ciaaw_draft:AW-Tl-standard-1925 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-standard-1961 ;
    dcterms:issued "1925"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1909 ;
    dcterms:source <https://doi.org/10.1039/CT9252700913> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.39 ] .

ciaaw_draft:AW-Tl-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1925 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.37 ] .

ciaaw_draft:AW-Tl-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-standard-1979 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.37 ;
            qudt:standardUncertainty 0.03 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tl-standard-1979 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-standard-1985 ;
    dcterms:issued "1979"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198052102349> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.383 ;
            qudt:standardUncertainty 0.001 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tl-standard-1985 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tl-standard ;
    dcterms:issued "1985"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tl-standard-1979 ;
    dcterms:source <https://doi.org/10.1351/pac198658121677> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Thallium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 204.3833 ;
            qudt:standardUncertainty 0.0002 ;
            ciaaw:significantFigures 7 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Thallium a chemrof:ChemicalElement ;
    rdfs:label "thallium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Tl-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Tl-standard,
        ciaaw_draft:AW-Tl-standard-1902,
        ciaaw_draft:AW-Tl-standard-1909,
        ciaaw_draft:AW-Tl-standard-1925,
        ciaaw_draft:AW-Tl-standard-1961,
        ciaaw_draft:AW-Tl-standard-1969,
        ciaaw_draft:AW-Tl-standard-1979,
        ciaaw_draft:AW-Tl-standard-1985 ;
    ciaaw:hasIsotope ciaaw_draft:Tl-203,
        ciaaw_draft:Tl-205 ;
    ciaaw:standardAtomicWeightLower 204.382 ;
    ciaaw:standardAtomicWeightUpper 204.385 ;
    chemrof:atomic_number 81 ;
    chemrof:symbol "Tl" .
```

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