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

# silicon-28

| Property | Value |
| --- | --- |
| Element | [silicon](../elements/Silicon.md) |
| Mass number | 28 |
| IRI | `https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/id/Si-28` |
| Wikidata | [Q2236831](https://www.wikidata.org/wiki/Q2236831) |

## Isotopic abundance

| Value | Year | Source | Status | Declaration |
| --- | --- | --- | --- | --- |
| [0.921 91, 0.923 18] | — | — | Current | [`Abundance-Si28`](Abundance-Si28.md) |

## Turtle

This resource as a file: [Si-28.ttl](Si-28.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:Silicon ciaaw:hasIsotope ciaaw_draft:Si-28 .

ciaaw_draft:Abundance-Si28 a ciaaw:IsotopicAbundanceDeclaration ;
    ciaaw:ofIsotope ciaaw_draft:Si-28 ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:lowerBound 0.92191 ;
            qudt:upperBound 0.92318 ;
            ciaaw:significantFiguresLower 5 ;
            ciaaw:significantFiguresUpper 5 ] .

ciaaw_draft:Si-28 a chemrof:Isotope ;
    ciaaw:currentAbundance ciaaw_draft:Abundance-Si28 ;
    ciaaw:hasDeclaration ciaaw_draft:Abundance-Si28 ;
    ciaaw:massNumber 28 .
```