Hafnium

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.

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Notion

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Science and technology

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What Wikipedia says

Hafnium is a chemical element; it has symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals.

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

Image: Alchemist-hp (talk) (www.pse-mendelejew.de), CC BY-SA 3.0 de, via Wikimedia Commons.