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