PROTOTYPE: a suggestion, not an official CIAAW or IUPAC page. Official values are at ciaaw.org.
IUPAC Project 2019-020-2-024Linked-data suggestion · unofficial prototype

helium

Property Value
Symbol He
Atomic number 2
IRI https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Helium
Wikidata Q560

Standard atomic weight

Value Year Source Status Declaration
4.002 602(2) 1983 10.1351/pac198456060653 Current AW-He-standard
4.002 60(1) 1969 10.1351/pac197021010091 Deprecated, see AW-He-standard AW-He-standard-1969
4.0026 1961 10.1021/ja00881a001 Deprecated, see AW-He-standard-1969 AW-He-standard-1961
4.003 1938 10.1039/JR9380001101 Deprecated, see AW-He-standard-1961 AW-He-standard-1938
4.002 1931 10.1039/JR9310001617 Deprecated, see AW-He-standard-1938 AW-He-standard-1931
4 1916 10.1021/ja02176a001 Deprecated, see AW-He-standard-1931 AW-He-standard-1916
3.99 1911 10.1021/ja01928a001 Deprecated, see AW-He-standard-1916 AW-He-standard-1911
4 1902 10.1007/BF01370337 Deprecated, see AW-He-standard-1911 AW-He-standard-1902

Notes: g r

Isotopes

A Representative isotopic composition Year Source Declaration ChEBI Wikidata
3 0.000 002(2) — — Abundance-He3 — Q533498
4 0.999 998(2) — — Abundance-He4 — Q1151346

Notes: g r

Notes

g Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty.

r Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given; the tabulated value and uncertainty should be applicable to normal material.

Bibliography

ANNUAL REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS, 1916. (1915). Journal of the American Chemical Society, 37(11), 2449–2452. https://doi.org/10.1021/ja02176a001 CrossRef Scholia
Atomic weights of the elements 1969. (1970). Pure and Applied Chemistry, 21(1), 91–108. https://doi.org/10.1351/pac197021010091 CrossRef Scholia
Baxter, G. P., Curie, Mme. M., Hönigschmid, O., Lebeau, P., & Meyer, R. J. (1931). First Report of the Committee on the Atomic Weights of the International Union of Chemistry. J. Chem. Soc., 0(0), 1617–1627. https://doi.org/10.1039/jr9310001617 CrossRef Scholia
Baxter, G. P., Hönigschmid, O., & Lebeau, P. (1938). Eighth Report of the Committee on Atomic Weights of the International Union of Chemistry. J. Chem. Soc., 0(0), 1101–1109. https://doi.org/10.1039/jr9380001101 CrossRef Scholia
Cameron, A. E., & Wichers, Edward. (1962). Report of the International Commission on Atomic Weights*(1961). Journal of the American Chemical Society, 84(22), 4175–4197. https://doi.org/10.1021/ja00881a001 CrossRef Scholia
Clarke, F. W., Thorpe, T. E., Ostwald, W., & Urbain, G. (1910). ANNUAL REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS, 1911. Journal of the American Chemical Society, 32(10), 1113–1116. https://doi.org/10.1021/ja01928a001 CrossRef Scholia
Holden, N. E., & Martin, R. L. (1984). Atomic weights of the elements 1983. Pure and Applied Chemistry, 56(6), 653–674. https://doi.org/10.1351/pac198456060653 CrossRef Scholia
Richards, Baxter, Hinrichsen, Köthner, P., & Pellini, S. (1902). Zur Festsetzung der Atomgewichte. Fresenius’ Zeitschrift für analytische Chemie, 41(2), 139–140. https://doi.org/10.1007/bf01370337 CrossRef Scholia

Turtle

This resource as a file: Helium.ttl

# 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 skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix unit: <http://qudt.org/vocab/unit/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

ciaaw:note-g a ciaaw:Footnote ;
    skos:definition "Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty."@en ;
    skos:notation "g" .

ciaaw:note-r a ciaaw:Footnote ;
    skos:definition "Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given; the tabulated value and uncertainty should be applicable to normal material."@en ;
    skos:notation "r" .

ciaaw_draft:AW-He-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard-1911 ;
    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:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.0 ] .

ciaaw_draft:AW-He-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1983"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198456060653> ;
    ciaaw:footnote ciaaw:note-g,
        ciaaw:note-r ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.002602 ;
            qudt:standardUncertainty 0.000002 ;
            ciaaw:significantFigures 7 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-He-standard-1911 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard-1916 ;
    dcterms:issued "1911"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01928a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 3.99 ] .

ciaaw_draft:AW-He-standard-1916 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard-1931 ;
    dcterms:issued "1916"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1911 ;
    dcterms:source <https://doi.org/10.1021/ja02176a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.00 ] .

ciaaw_draft:AW-He-standard-1931 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard-1938 ;
    dcterms:issued "1931"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1916 ;
    dcterms:source <https://doi.org/10.1039/JR9310001617> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.002 ] .

ciaaw_draft:AW-He-standard-1938 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard-1961 ;
    dcterms:issued "1938"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1931 ;
    dcterms:source <https://doi.org/10.1039/JR9380001101> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.003 ] .

ciaaw_draft:AW-He-standard-1961 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard-1969 ;
    dcterms:issued "1961"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1938 ;
    dcterms:source <https://doi.org/10.1021/ja00881a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.0026 ] .

ciaaw_draft:AW-He-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-He-standard ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-He-standard-1961 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Helium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 4.00260 ;
            qudt:standardUncertainty 0.00001 ;
            ciaaw:significantFigures 6 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Helium a chemrof:ChemicalElement ;
    rdfs:label "helium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-He-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-He-standard,
        ciaaw_draft:AW-He-standard-1902,
        ciaaw_draft:AW-He-standard-1911,
        ciaaw_draft:AW-He-standard-1916,
        ciaaw_draft:AW-He-standard-1931,
        ciaaw_draft:AW-He-standard-1938,
        ciaaw_draft:AW-He-standard-1961,
        ciaaw_draft:AW-He-standard-1969 ;
    ciaaw:hasIsotope ciaaw_draft:He-3,
        ciaaw_draft:He-4 ;
    ciaaw:standardAtomicWeightUncertainty 0.000002 ;
    ciaaw:standardAtomicWeightValue 4.002602 ;
    chemrof:atomic_number 2 ;
    chemrof:symbol "He" .

All atomic weights · All isotopic abundances