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'''Potassium''' is a [[chemical element]]; it has [[Symbol (chemistry)|symbol]] '''K''' (from [[Neo-Latin]] {{lang|la|kalium}}) and [[atomic number]]{{nbsp}}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 plants, from which its name derives. In the [[periodic table]], potassium is one of the [[alkali metal]]s, all of which have a single [[valence electron]] in the outer electron shell, which is easily removed to create [[cation|an ion with a positive charge]] (which combines with [[anion]]s to form [[salts]]). In nature, potassium occurs only in ionic salts. Elemental potassium reacts vigorously with water, generating sufficient heat to ignite [[hydrogen]] emitted in the reaction, and burning with a [[lilac]]-[[flame color|colored flame]]. It is found dissolved in seawater (which is 0.04% potassium by weight), and occurs in many [[mineral]]s such as [[orthoclase]], a common constituent of [[granite]]s and other [[igneous rock]]s.

Translations:Potassium/2/en - Revision history

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