Potassium

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. A soft, silver-white, highly or explosively reactive metallic element that occurs in nature only in compounds. It is obtained by electrolysis of its common hydroxide and found in, or converted to, a wide variety of salts used especially in fertilizers and soaps. Atomic number 19; atomic weight 39.098; melting point 63.65°C; boiling point 774°C; specific gravity 0.862; valence 1. See Table at element.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. A soft, waxy, silvery reactive metal that is never found unbound in nature; an element (symbol K) with an atomic number of 19 and atomic weight of 39.0983. The symbol is derived from the Latin kalium.
  • the GNU version of the Collaborative International Dictionary of English
  • n. An Alkali element, occurring abundantly but always combined, as in the chloride, sulphate, carbonate, or silicate, in the minerals sylvite, kainite, orthoclase, muscovite, etc. Atomic weight 39.0. Symbol K (Kalium).
  • The Century Dictionary and Cyclopedia
  • n. Chemical symbol, K (for kalium); atomic weight, 39.1. The metallic base of the alkali potash, a substance not occurring uncombined in nature, but in various combinations widely diffused and of the highest importance. See potash.
  • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • n. a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
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    sodium    lithium    zinc    chloride    chlorate