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Calcium
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Chemical element with atomic number 20 (Ca)
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Wikipedia

Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust, and...

Instance of
Chemical element
Essential medicines
lithophile
References
Wikidata