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

# terbium

| Property | Value |
| --- | --- |
| Symbol | Tb |
| Atomic number | 65 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Terbium` |
| Wikidata | [Q1838](https://www.wikidata.org/wiki/Q1838) |

## Standard atomic weight

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 158.925 354(7) | 2021 | [10.1515/pac-2019-0603](https://doi.org/10.1515/pac-2019-0603) | Current | [`AW-Tb-standard`](../id/AW-Tb-standard.md) |
| 158.925 354(8) | 2017 | [10.1515/pac-2019-0603](https://doi.org/10.1515/pac-2019-0603) | Deprecated, see [`AW-Tb-standard`](../id/AW-Tb-standard.md) | [`AW-Tb-standard-2017`](../id/AW-Tb-standard-2017.md) |
| 158.925 35(2) | 2005 | [10.1351/pac200678112051](https://doi.org/10.1351/pac200678112051) | Deprecated, see [`AW-Tb-standard-2017`](../id/AW-Tb-standard-2017.md) | [`AW-Tb-standard-2005`](../id/AW-Tb-standard-2005.md) |
| 158.925 34(2) | 1995 | [10.1351/pac199668122339](https://doi.org/10.1351/pac199668122339) | Deprecated, see [`AW-Tb-standard-2005`](../id/AW-Tb-standard-2005.md) | [`AW-Tb-standard-1995`](../id/AW-Tb-standard-1995.md) |
| 158.925 34(3) | 1985 | [10.1351/pac198658121677](https://doi.org/10.1351/pac198658121677) | Deprecated, see [`AW-Tb-standard-1995`](../id/AW-Tb-standard-1995.md) | [`AW-Tb-standard-1985`](../id/AW-Tb-standard-1985.md) |
| 158.9254(1) | 1969 | [10.1351/pac197021010091](https://doi.org/10.1351/pac197021010091) | Deprecated, see [`AW-Tb-standard-1985`](../id/AW-Tb-standard-1985.md) | [`AW-Tb-standard-1969`](../id/AW-Tb-standard-1969.md) |
| 158.924 | 1961 | [10.1021/ja00881a001](https://doi.org/10.1021/ja00881a001) | Deprecated, see [`AW-Tb-standard-1969`](../id/AW-Tb-standard-1969.md) | [`AW-Tb-standard-1961`](../id/AW-Tb-standard-1961.md) |
| 158.93 | 1953 | [10.1039/JR9540004713](https://doi.org/10.1039/JR9540004713) | Deprecated, see [`AW-Tb-standard-1961`](../id/AW-Tb-standard-1961.md) | [`AW-Tb-standard-1953`](../id/AW-Tb-standard-1953.md) |
| 159.2 | 1907 | [10.1021/ja01956a001](https://doi.org/10.1021/ja01956a001) | Deprecated, see [`AW-Tb-standard-1953`](../id/AW-Tb-standard-1953.md) | [`AW-Tb-standard-1907`](../id/AW-Tb-standard-1907.md) |
| 160 | 1902 | [10.1007/BF01370337](https://doi.org/10.1007/BF01370337) | Deprecated, see [`AW-Tb-standard-1907`](../id/AW-Tb-standard-1907.md) | [`AW-Tb-standard-1902`](../id/AW-Tb-standard-1902.md) |


## Isotopes

| A | Representative isotopic composition | Year | Source | Declaration | ChEBI | Wikidata |
| --- | --- | --- | --- | --- | --- | --- |
| [159](../id/Tb-159.md) | 1 | — | — | [`Abundance-Tb159`](../id/Abundance-Tb159.md) | — | [Q2554426](https://www.wikidata.org/wiki/Q2554426) |

## 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">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., Moissan, H., &#38; Ostwald, W. (1907). REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS. 1907. <i>Journal of the American Chemical Society</i>, <i>29</i>(2), 107–111. https://doi.org/10.1021/ja01956a001 <a href="https://doi.org/10.1021/ja01956a001">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1021/ja01956a001">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">International atomic weights, 1953. (1954). <i>Journal of the Chemical Society (Resumed)</i>, 4713. https://doi.org/10.1039/jr9540004713 <a href="https://doi.org/10.1039/JR9540004713">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1039/JR9540004713">Scholia</a></div>
<div class="csl-entry">Prohaska, T., Irrgeher, J., Benefield, J., Böhlke, J. K., Chesson, L. A., Coplen, T. B., Ding, T., Dunn, P. J. H., Gröning, M., Holden, N. E., Meijer, H. A. J., Moossen, H., Possolo, A., Takahashi, Y., Vogl, J., Walczyk, T., Wang, J., Wieser, M. E., Yoneda, S., … Meija, J. (2022). Standard atomic weights of the elements 2021 (IUPAC Technical Report). <i>Pure and Applied Chemistry</i>, <i>94</i>(5), 573–600. https://doi.org/10.1515/pac-2019-0603 <a href="https://doi.org/10.1515/pac-2019-0603">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1515/pac-2019-0603">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. (2006). Atomic weights of the elements 2005 (IUPAC Technical Report). <i>Pure and Applied Chemistry</i>, <i>78</i>(11), 2051–2066. https://doi.org/10.1351/pac200678112051 <a href="https://doi.org/10.1351/pac200678112051">CrossRef</a> <a href="https://qlever.scholia.wiki/doi/10.1351/pac200678112051">Scholia</a></div>
</div>

## Turtle

This resource as a file: [Terbium.ttl](Terbium.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-Tb-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-1907 ;
    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:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 160.0 ] .

ciaaw_draft:AW-Tb-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "2021"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-2017 ;
    dcterms:source <https://doi.org/10.1515/pac-2019-0603> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.925354 ;
            qudt:standardUncertainty 0.000007 ;
            ciaaw:significantFigures 9 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tb-standard-1907 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-1953 ;
    dcterms:issued "1907"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01956a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 159.2 ] .

ciaaw_draft:AW-Tb-standard-1953 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-1961 ;
    dcterms:issued "1953"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1907 ;
    dcterms:source <https://doi.org/10.1039/JR9540004713> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.93 ] .

ciaaw_draft:AW-Tb-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1953 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.924 ] .

ciaaw_draft:AW-Tb-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-1985 ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.9254 ;
            qudt:standardUncertainty 0.0001 ;
            ciaaw:significantFigures 7 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tb-standard-1985 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-1995 ;
    dcterms:issued "1985"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198658121677> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.92534 ;
            qudt:standardUncertainty 0.00003 ;
            ciaaw:significantFigures 8 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tb-standard-1995 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-2005 ;
    dcterms:issued "1995"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1985 ;
    dcterms:source <https://doi.org/10.1351/pac199668122339> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.92534 ;
            qudt:standardUncertainty 0.00002 ;
            ciaaw:significantFigures 8 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tb-standard-2005 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard-2017 ;
    dcterms:issued "2005"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-1995 ;
    dcterms:source <https://doi.org/10.1351/pac200678112051> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.92535 ;
            qudt:standardUncertainty 0.00002 ;
            ciaaw:significantFigures 8 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Tb-standard-2017 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Tb-standard ;
    dcterms:issued "2017"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Tb-standard-2005 ;
    dcterms:source <https://doi.org/10.1515/pac-2019-0603> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Terbium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 158.925354 ;
            qudt:standardUncertainty 0.000008 ;
            ciaaw:significantFigures 9 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Terbium a chemrof:ChemicalElement ;
    rdfs:label "terbium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Tb-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Tb-standard,
        ciaaw_draft:AW-Tb-standard-1902,
        ciaaw_draft:AW-Tb-standard-1907,
        ciaaw_draft:AW-Tb-standard-1953,
        ciaaw_draft:AW-Tb-standard-1961,
        ciaaw_draft:AW-Tb-standard-1969,
        ciaaw_draft:AW-Tb-standard-1985,
        ciaaw_draft:AW-Tb-standard-1995,
        ciaaw_draft:AW-Tb-standard-2005,
        ciaaw_draft:AW-Tb-standard-2017 ;
    ciaaw:hasIsotope ciaaw_draft:Tb-159 ;
    ciaaw:standardAtomicWeightUncertainty 0.000007 ;
    ciaaw:standardAtomicWeightValue 158.925354 ;
    chemrof:atomic_number 65 ;
    chemrof:symbol "Tb" .
```

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