Lanthanum

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Science and technology

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What Wikipedia says

Lanthanum is a chemical element; it has symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. It is the first and the prototype of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table.

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

Image: Lanthan_1.jpg: Tomihahndorf derivative work: Materialscientist (talk), CC BY-SA 3.0, via Wikimedia Commons.