Calcium

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

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.

Excerpt from the Wikipedia article “Calcium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: de:Benutzer:Tomihahndorf, CC BY-SA 3.0, via Wikimedia Commons.