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

# potassium-40

| Property | Value |
| --- | --- |
| Element | [potassium](../elements/Potassium.md) |
| Mass number | 40 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/id/K-40` |
| Wikidata | [Q2251076](https://www.wikidata.org/wiki/Q2251076) |

## Isotopic abundance

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| 0.000 117(1) | — | — | Current | [`Abundance-K40`](Abundance-K40.md) |

## Turtle

This resource as a file: [K-40.ttl](K-40.ttl)

```turtle
# Prototype: a suggestion, not an official CIAAW or IUPAC record. Official values are at https://ciaaw.org

@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 element: <https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

element:Potassium ciaaw:hasIsotope ciaaw_draft:K-40 .

ciaaw_draft:Abundance-K40 a ciaaw:IsotopicAbundanceDeclaration ;
    ciaaw:ofIsotope ciaaw_draft:K-40 ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 0.000117 ;
            qudt:standardUncertainty 0.000001 ;
            ciaaw:significantFigures 3 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:K-40 a chemrof:Isotope ;
    ciaaw:currentAbundance ciaaw_draft:Abundance-K40 ;
    ciaaw:hasDeclaration ciaaw_draft:Abundance-K40 ;
    ciaaw:massNumber 40 .
```