Calcium

• Health: Nutrition: Nutrients: Vitamins and Minerals: Calcium  (5)
• Health: Pharmacy: Drugs and Medications: C: Calcium  (14)
• Shopping: Health: Nutrition: Supplements: Vitamins and Minerals: Calcium  (2)

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.