- ChemicalElements.com: Calcium
 - Overview with basic information, atomic structure, isotopes, and more. - EnvironmentalChemistry.com: Calcium
- Features overview, name in other languages, atomic structure, chemical properties, physical properties, and regulatory information.
- WebElements: Calcium
- Provides key data about the element, types of calcium compounds, electronic and physical properties, crystallography, and more.
- Wikipedia: Calcium
- Hyperlinked article on the element with notable characteristics, applications, compounds, and isotopes.
|
