Kalsium: Verskil tussen weergawes

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== Eksterne skakels ==
{{CommonsKategorie|Calcium}}
*[http://www.webelements.com/webelements/elements/text/Ca/index.html WebElements.com – Calcium]
* [http://environmentalchemistrywww.webelements.com/yogiwebelements/periodicelements/text/Ca/index.html EnvironmentalChemistryWebElements.com – Calcium]
* [http://environmentalchemistry.com/yogi/periodic/Ca.html EnvironmentalChemistry.com – Calcium]
 
[[Kategorie:Chemiese elemente]]