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