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

# Standard atomic weight of lanthanum

| Property | Value |
| --- | --- |
| About | [lanthanum](../elements/Lanthanum.md) |
| Value | 139 |
| Year | 1909 |
| Source | [10.1021/ja01931a001](https://doi.org/10.1021/ja01931a001) |
| Status | Deprecated, see [`AW-La-standard-1925`](AW-La-standard-1925.md) |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/id/AW-La-standard-1909` |

## Turtle

This resource as a file: [AW-La-standard-1909.ttl](AW-La-standard-1909.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 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 unit: <http://qudt.org/vocab/unit/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

element:Lanthanum ciaaw:hasDeclaration ciaaw_draft:AW-La-standard-1909 .

ciaaw_draft:AW-La-standard-1903 dcterms:isReplacedBy ciaaw_draft:AW-La-standard-1909 .

ciaaw_draft:AW-La-standard-1925 dcterms:replaces ciaaw_draft:AW-La-standard-1909 .

ciaaw_draft:AW-La-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-La-standard-1925 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-La-standard-1903 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Lanthanum ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 139.0 ] .
```