calcium

Property	Value
Symbol	Ca
Atomic number	20
IRI	`https://hendrikborgelt.github.io/Draft_for_IUPAC_CIAAW-Isotopic-Abundances-and-Atomic-Weights/elements/Calcium`
Wikidata	Q706

Standard atomic weight

Value	Year	Source	Status	Declaration
40.078(4)	1983	10.1351/pac198456060653	Current	`AW-Ca-standard`
40.08(1)	1969	10.1351/pac197021010091	Deprecated, see `AW-Ca-standard`	`AW-Ca-standard-1969`
40.08	1931	10.1039/JR9310001617	Deprecated, see `AW-Ca-standard-1969`	`AW-Ca-standard-1931`
40.07	1912	10.1021/ja02224a601	Deprecated, see `AW-Ca-standard-1931`	`AW-Ca-standard-1912`
40.09	1909	10.1021/ja01931a001	Deprecated, see `AW-Ca-standard-1912`	`AW-Ca-standard-1909`
40.1	1902	10.1007/BF01370337	Deprecated, see `AW-Ca-standard-1909`	`AW-Ca-standard-1902`

Notes: g

Isotopes

A	Representative isotopic composition	Year	Source	Declaration	ChEBI	Wikidata
40	0.969 41(156)	—	—	`Abundance-Ca40`	—	Q2376511
42	0.006 47(23)	—	—	`Abundance-Ca42`	—	Q2728105
43	0.001 35(10)	—	—	`Abundance-Ca43`	—	Q2103298
44	0.020 86(110)	—	—	`Abundance-Ca44`	—	Q3027367
46	0.000 04(3)	—	—	`Abundance-Ca46`	—	Q4845109
48	0.001 87(21)	—	—	`Abundance-Ca48`	—	Q659024

Notes: g

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.

Bibliography

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

Clarke, F. W., Ostwald, W., Thorpe, T. E., & Urbain, G. (1909). REPORT OF THE INTERNATIONAL COMMITTEE ON ATOMIC WEIGHTS. 1909. Journal of the American Chemical Society, 31(1), 1–6. https://doi.org/10.1021/ja01931a001 CrossRef Scholia

Clarke, F., Thorpe, T., Ostwald, W., & Urbain, G. (1911). Annual Report of the International Committee on Atomic Weights, 1912. Journal of the American Chemical Society, 33(11), 1639–1642. https://doi.org/10.1021/ja02224a601 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: Calcium.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_draft:AW-Ca-standard-1902 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ca-standard-1909 ;
    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:Calcium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 40.1 ] .

ciaaw_draft:AW-Ca-standard a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:issued "1983"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ca-standard-1969 ;
    dcterms:source <https://doi.org/10.1351/pac198456060653> ;
    ciaaw:footnote ciaaw:note-g ;
    ciaaw:ofElement element:Calcium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 40.078 ;
            qudt:standardUncertainty 0.004 ;
            ciaaw:significantFigures 5 ;
            ciaaw:significantFiguresUncertainty 1 ] .

ciaaw_draft:AW-Ca-standard-1909 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ca-standard-1912 ;
    dcterms:issued "1909"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ca-standard-1902 ;
    dcterms:source <https://doi.org/10.1021/ja01931a001> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Calcium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 40.09 ] .

ciaaw_draft:AW-Ca-standard-1912 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ca-standard-1931 ;
    dcterms:issued "1912"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ca-standard-1909 ;
    dcterms:source <https://doi.org/10.1021/ja02224a601> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Calcium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 40.07 ] .

ciaaw_draft:AW-Ca-standard-1931 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ca-standard-1969 ;
    dcterms:issued "1931"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ca-standard-1912 ;
    dcterms:source <https://doi.org/10.1039/JR9310001617> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Calcium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 40.08 ] .

ciaaw_draft:AW-Ca-standard-1969 a ciaaw:StandardAtomicWeightDeclaration ;
    dcterms:isReplacedBy ciaaw_draft:AW-Ca-standard ;
    dcterms:issued "1969"^^xsd:gYear ;
    dcterms:replaces ciaaw_draft:AW-Ca-standard-1931 ;
    dcterms:source <https://doi.org/10.1351/pac197021010091> ;
    owl:deprecated true ;
    adms:status <http://purl.org/adms/status/Deprecated> ;
    ciaaw:ofElement element:Calcium ;
    ciaaw:value [ a qudt:QuantityValue ;
            qudt:hasUnit unit:UNITLESS ;
            qudt:numericValue 40.08 ;
            qudt:standardUncertainty 0.01 ;
            ciaaw:significantFigures 4 ;
            ciaaw:significantFiguresUncertainty 1 ] .

element:Calcium a chemrof:ChemicalElement ;
    rdfs:label "calcium"@en ;
    ciaaw:currentStandardAtomicWeight ciaaw_draft:AW-Ca-standard ;
    ciaaw:hasDeclaration ciaaw_draft:AW-Ca-standard,
        ciaaw_draft:AW-Ca-standard-1902,
        ciaaw_draft:AW-Ca-standard-1909,
        ciaaw_draft:AW-Ca-standard-1912,
        ciaaw_draft:AW-Ca-standard-1931,
        ciaaw_draft:AW-Ca-standard-1969 ;
    ciaaw:hasIsotope ciaaw_draft:Ca-40,
        ciaaw_draft:Ca-42,
        ciaaw_draft:Ca-43,
        ciaaw_draft:Ca-44,
        ciaaw_draft:Ca-46,
        ciaaw_draft:Ca-48 ;
    ciaaw:standardAtomicWeightUncertainty 0.004 ;
    ciaaw:standardAtomicWeightValue 40.078 ;
    chemrof:atomic_number 20 ;
    chemrof:symbol "Ca" .

All atomic weights · All isotopic abundances