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cation
The Columbia Encyclopedia, Sixth Edition | Date: 2008
cation , atom or group of atoms carrying a positive charge. The charge results because there are more protons than electrons in the cation. Cations can be formed from a metal by oxidation (see oxidation and reduction ), from a neutral base (see acids and bases ) by protonation, or from a polar compound by ionization. Cationic species include Na + , Mg ++ , and NH 4+ . The cations of the transition elements have characteristic colors in water solution. Salts are made up of cations and anions . See ion .
Author not available, CATION.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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cation
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cation Chemical term for a positively charged ion .
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cation channel n. An ion channel across a cell membrane permitting the transport of cations across it. See also sodium channel . Compare anion channel .
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... are hydrated sulfates of a univalent cation (e.g., potassium, sodium, ammonium, cesium, or thallium) and a trivalent cation (e.g., aluminum, chromium, iron, manganese ... a double sulfate salt of a divalent cation (e.g., magnesium or calcium) and a ...
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Compounds
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... that form positively charged ions, or cations (pronounced KAT-ieunz). The third consists ... involving a metal that always forms a cation of a certain electric charge. Type II ... typically a transition metal) that forms cations with differing charges. Type III: Compounds ...
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... solution, exchange occurs between the loosely held zeolite cation and the dissolved cation. In synthetic ion exchangers, used in laboratories ... RESINS AND SEMIPERMEABLE MEMBRANES. Anion resins and cation resins are both solid materials, but in an anion resin ... negative ions in the solution. The reverse ...
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