- Valence (chemistry)
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Valence (chemistry)
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Valence (chemistry) — For other uses, see Valence (disambiguation). In chemistry, valence, also known as valency or valence number, is a measure of the number of bonds formed by an atom of a given element. Valence can be defined as the number of valence bonds[1] a… … Wikipedia
Valence — may refer to:In molecules, atoms, or subatomic particles* Valence (chemistry) * Valence bond theory in chemistry * Valence shell in chemistry * Valence band in physics * Valence quarks (see quark model) in particle physics In other sciences*… … Wikipedia
VALENCE — À toute représentation de la matière qui la suppose grenue, se rattachent deux genres d’intuitions, l’une privilégiant les formes, l’autre les forces. On peut, en effet, imaginer sous le mode de l’intensité les interactions entre les particules… … Encyclopédie Universelle
chemistry — /kem euh stree/, n., pl. chemistries. 1. the science that deals with the composition and properties of substances and various elementary forms of matter. Cf. element (def. 2). 2. chemical properties, reactions, phenomena, etc.: the chemistry of… … Universalium
Chemistry — For other uses, see Chemistry (disambiguation). Chemistry is the science of atomic matter (that made of chemical elements), its properties, structure, comp … Wikipedia
Valence electron — In chemistry, valence electrons are the electrons contained in the outermost, or valence , electron shell of an atom. Valence electrons are important in determining how an element reacts chemically with other elements: The fewer valence electrons … Wikipedia
Valence bond theory — In chemistry, valence bond theory explains the nature of a chemical bond in a molecule in terms of atomic valencies. [Murrel, JN, Kettle, SF Tedder, JM The Chemical Bond , John Wiley Sons (1985) ISBN 0 471 90759 6] Valence bond theory summarizes… … Wikipedia
Valence isomer — In organic chemistry, two molecules are valence isomers when they are constitutional isomers that can interconvert through pericyclic reactions. [GoldBookRef |file=V06590 |year=1994 |title=Valence isomer] For example, Dewar benzene transforms… … Wikipedia
Valence bond codes — VB computer programs for modern valence bond calculations: * CRUNCH is by Gordon A. Gallup and his group. [ [http://phy ggallup.unl.edu/crunch CRUNCH] ] * GAMESS (UK) includes calculation of VB wave functions by the TURTLE code, due to J.H. van… … Wikipedia
valence — UK [ˈveɪləns] / US noun [countable] Word forms valence : singular valence plural valences chemistry mainly American the valency of an atom … English dictionary
valence — valance, valence, valency A valance, pronounced val ǝns, is a short curtain round the edge of a canopy or bed. Valence and valency (both pronounced vayl , the first more common in AmE and the second in BrE) are terms in chemistry relating to the… … Modern English usage
