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Potassium
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Chemical element with atomic number 19 (K)
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Wikipedia

Potassium is a chemical element; it has symbol K (from Neo-Latin kalium) and atomic number 19. It is a silvery white metal that is soft enough to easily cut with a knife. Potassium metal reacts rapidly with atmospheric oxygen to form flaky white potassium peroxide in only seconds of exposure. It was first isolated from potash, the ashes of...

Instance of
Chemical element
lithophile
Subclass of
Alkali metal
Metal
S-block
Part of
group 1
References
Wikidata