Coronium

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Coronium was the name of a suggested chemical element that was hypothesised in the 19th century. The name, inspired by the solar corona, was given by Gruenwald in 1887.

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

Image: Luc Viatour, CC BY-SA 3.0, via Wikimedia Commons.