- ChemGlobe – Calcium
- Information provided detailing its electronic, therma and steric data. With historical data presented.
- Chemical Elements.com – Calcium
- Points out the element’s energy levels, temperature points, classification and atomic structure.
- Environmental Chemistry.com – Calcium
- Regulations on its uses presented. Features naming configuration in different languages.
- Jefferson Lab - Calcium
- Atomic structure of the element provided including details on industrial uses and location of its sources.
- LANL – Calcium
- References for the element’s compounds and overview of discovery. Includes its occurrence and properties.
- Lenntech – Calcium
- Details its uses in different industries. With information on its atomic structure, ionization energies and physical classifications.
- Visual Elements – Calcium
- Discusses the soft metal’s properties and structure attributing to its various uses.
- Web Elements.com – Calcium
- Brief presentation on its physical structure, chemical compounds, grouping schemes and classifications.
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