cation

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cation

(kăt'ī`ən), 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 reductionoxidation and reduction,
complementary chemical reactions characterized by the loss or gain, respectively, of one or more electrons by an atom or molecule. Originally the term oxidation
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), from a neutral base (see acids and basesacids and bases,
two related classes of chemicals; the members of each class have a number of common properties when dissolved in a solvent, usually water. Properties
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) by protonation, or from a polar compound by ionization. Cationic species include Na+, Mg++, and NH4+. The cations of the transition elementstransition elements
or transition metals,
in chemistry, group of elements characterized by the filling of an inner d electron orbital as atomic number increases.
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 have characteristic colors in water solution. Saltssalt,
chemical compound (other than water) formed by a chemical reaction between an acid and a base (see acids and bases). Characteristics and Classification of Salts

The most familiar salt is sodium chloride, the principal component of common table salt.
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 are made up of cations and anionsanion
, atom or group of atoms carrying a negative charge. The charge results because there are more electrons than protons in the anion. Anions can be formed from nonmetals by reduction (see oxidation and reduction) or from neutral acids (see acids and bases) or polar compounds
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. See ionion,
atom or group of atoms having a net electric charge. Positive and Negative Electric Charges

A neutral atom or group of atoms becomes an ion by gaining or losing one or more electrons or protons.
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.

cation

[′kat‚ī·ən]
(chemistry)
A positively charged atom or group of atoms, or a radical which moves to the negative pole (cathode) during electrolysis.

cation

a positively charged ion; an ion that is attracted to the cathode during electrolysis
References in periodicals archive ?
Larger quantities of cations are removed in harvested biomass by annual crops than by grazing of perennial pasture (Williams and Haynes 1992; Nicholls 2009).
In this work, we propose that appearance of overshooting effect may be attributed to the chelation between cations and the anionic groups on the polymer chains, which leads to the variation of crosslinking degree and the reorganization of the gel structure.
These data indicate a significant role for divalent cations and extracellular DNA in forming biofilms by L.
It is an all-yearround service that lets candidates access a record of their quali cations and achievements throughout their academic career.
2+] are the dominant exchangeable cations in these soils (Table 1).
Numerous computational studies [22-43] have been carried out to study the structure and energetics of interactions between alkali metal cations and different Lewis bases.
These protons now in the soil solution may diffuse to clay particles and replace cations.
The anion gap is commonly used in clinical practice, especially in critically ill patients, as an approximation of the difference between the concentration of unmeasured anions and unmeasured cations in plasma.
The amount of Al, Fe and acidic cations was greater in ridge soils at both Ciales and Luquillo, and in foothill soils at Guanica.
Apple Synergic makes it possible to increase the cation exchange capacity (CEC) in the intestine and thus the assimilation of cations such as calcium, magnesium and potassium.