
1) Ammonia 2) Ammonium ion
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The ammonium cation is a positively charged polyatomic ion with the chemical formula NH4+. It is formed by the protonation of ammonia (NH3). Ammonium is also a general name for positively charged or protonated substituted amines and quaternary ammonium cations (NR4+), where one or more hydrogen atoms are replaced by organic radical groups (indicat...
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• (n.) A compound radical, NH4, having the chemical relations of a strongly basic element like the alkali metals.
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A form of nitrogen that is commonly found in the soil.
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NH4 Molar mass: 18.03846
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(ә-mo´ne-әm) a hypothetical radical, NH4, forming salts analogous to those of the alkaline metals. ammonium carbonate a mixture of ammonium compounds used as a liquefying expectorant in the treatment of chronic bronchitis and similar lung disorders. It is sometimes us...
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http://www.encyclo.co.uk/local/21001
Am·mo'ni·um noun [ See
Ammonia .]
(Chemistry) A compound radical, NH
4 , having the chemical relations of a strongly basic element like the alkali metals.
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http://www.encyclo.co.uk/webster/A/71

Type: Term Pronunciation: ă-mō′nē-yŭm Definitions: 1. An ion, NH
4+, formed by combining NH
3 and H+ (the pK
a value is 9.24); acts as a univalent metal in forming ammonium compounds.
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Chemical compound composed of nitrogen and hydrogen (NH
4). Component of the nitrogen cycle. Product of organic matter decomposition. Can be fixed to clay minerals and later exchanged.
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Ammonium is the basic radical of ammonium salts. It is comprised of one atom of nitrogen and four atoms of hydrogen.
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[
n] - the ion NH4 derived from ammonia
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http://www.webdictionary.co.uk/definition.php?query=ammonium
ammonium ion noun the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
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https://www.encyclo.co.uk/local/20974

the univalent ion, NH, or group, NH, which plays the part of a metal in the salt formed when ammonia reacts with an acid.
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