» Calcium - Data tables and historic information.
» ChemGlobe: Calcium - Electronic, thermal, and steric data along with an isotope table.
» ChemicalElements.com: Calcium - Basic information, atomic structure, and isotopes.
» EnvironmentalChemistry.com: Calcium - Atomic structure, chemical and physical properties, and table of nuclides.
» It's Elemental: Calcium - Basic physical and historical information.
» LANL: Calcium - History, sources, properties, uses, and compounds.
» Lenntech: Calcium - Physical data, chemical properties, and health effects.
» Visual Elements: Calcium - Image, animation, source, uses, and physical information.
» WebElements: Calcium - Extensive information on history, uses, occurrence, compounds, and properties of the element.
» Wikipedia: Calcium - Properties of the element, including its history, applications, and characteristics.
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