- Wikipedia: Calcium
Hyperlinked article on the element with notable characteristics, applications, compounds, and isotopes.
en.wikipedia.org/wiki/Calcium
- ChemicalElements.com: Calcium
Overview with basic information, atomic structure, isotopes, and more.
www.chemicalelements.com/elements/ca.html
- EnvironmentalChemistry.com: Calcium
Features overview, name in other languages, atomic structure, chemical properties, physical properties, and regulatory information.
environmentalchemistry.com/yogi/periodic/Ca.html
- WebElements: Calcium
Provides key data about the element, types of calcium compounds, electronic and physical properties, crystallography, and more.
www.webelements.com/webelements/elements/text/Ca
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