- Calcium - Data tables and historic information.
www.scescape.net/~woods/elements/calcium.html
- ChemGlobe: Calcium - Electronic, thermal, and steric data along with an isotope table.
www.vcs.ethz.ch/chemglobe/ptoe/_/20.html
- ChemicalElements.com: Calcium - Basic information, atomic structure, and isotopes.
www.chemicalelements.com/elements/ca.html
- It's Elemental: Calcium - Basic physical and historical information.
education.jlab.org/itselemental/ele020.html
- LANL: Calcium - History, sources, properties, uses, and compounds.
pearl1.lanl.gov/periodic/elements/20.html
- Visual Elements: Calcium - Image, animation, source, uses, and physical information.
www.chemsoc.org/viselements/pages/calcium.html
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