Alkalide

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What Wikipedia says

An alkalide is a chemical compound in which alkali metal atoms are anions (negative ions) with a charge or oxidation state of −1. Until the first discovery of alkalides in the 1970s, alkali metals were known to appear in salts only as cations (positive ions) with a charge or oxidation state of +1.

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

Image: 范皓程, CC BY 4.0, via Wikimedia Commons.