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Valence   /vˈeɪləns/   Listen
noun
Valence  n.  (Chem.) The degree of combining power of an atom (or radical) as shown by the number of atoms of hydrogen (or of other monads, as chlorine, sodium, etc.) with which it will combine, or for which it can be substituted, or with which it can be compared; thus, an atom of hydrogen is a monad, and has a valence of one; the atoms of oxygen, nitrogen, and carbon are respectively dyads, triads, and tetrads, and have a valence respectively of two, three, and four. Note: The valence of certain elements varies in different compounds. Valence in degree may extend as high as seven or eight, as in the cases of iodine and osmium respectively. The doctrine of valence has been of fundamental importance in distinguishing the equivalence from the atomic weight, and is an essential factor in explaining the chemical structures of compounds.






Collaborative International Dictionary of English 0.48








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"Valence" Quotes from Famous Books



... his head. Over the fireplace were the coats-of-arms of a number of houses allied by blood or by marriage to the Lorings. The two cresset-lights which flared upon each side gleamed upon the blue lion of the Percies, the red birds of de Valence, the black engrailed cross of de Mohun, the silver star of de Vere, and the ruddy bars of FitzAlan, all grouped round the famous red roses on the silver shield which the Lorings had borne to glory upon many a bloody field. Then from side to side the room was spanned by ...
— Sir Nigel • Arthur Conan Doyle

... collected a few nobles, such as Lennox, Atholl, Errol, and a brother of the chief of the Frazers. Other chiefs, kinsmen of the slain Comyn, among them Macdowal of Argyll, banded to avenge the victim; Bruce's little force was defeated at Methven Wood, near Perth, by Aymer de Valence, and prisoners of all ranks were hanged as traitors, while two bishops were placed in irons. Bruce took to the heather, pursued by the Macdowals no less than by the English; his queen was captured, his brother Nigel ...
— A Short History of Scotland • Andrew Lang

... now till to-morrow," replied the child, "Valence will think me a coward." Then shaking his head, "It is too long till to-morrow." And he ...
— The Companions of Jehu • Alexandre Dumas, pere

... authorized by Charles X. to go to the south to meet her father, her step-mother, and her sisters, left Saint Cloud, October 10, 1829. The 17th, she was at Lyons, whither she promised to return. At Valence, she found her step-brother and her sister, the Infante and Infanta Francois de Paule, and returned with them to Lyons, where, October 20, she was greeted by a great crowd, eager to look upon her face. At the Grand Theatre Their Highnesses assisted ...
— The Duchess of Berry and the Court of Charles X • Imbert De Saint-Amand

... flashes of armour, and dark with the number of banners which floated over them. Edward himself commanded this tremendous array, and, in order to guard his person, was attended by four hundred chosen men at arms. Immediately around the King waited Sir Aymer de Valence, that Earl of Pembroke who defeated Bruce at Methven Wood, but was now to see a very different day; Sir Giles de Argentine, a Knight of St. John of Jerusalem, who was accounted, for his deeds in Palestine and elsewhere, one of the best ...
— The Mirror of Literature, Amusement, and Instruction - Volume 14, No. 406, Saturday, December 26, 1829. • Various

... emperors, established themselves in various parts of the country. This opinion, in the judgment of the Abbe De la Rue, receives confirmation from the circumstance of there being another village called Allemagne, in the vicinity of Valence, where it is known that a body of the same people was fixed; and it may perhaps be adduced as a still farther proof of its correctness, that the village of Allemagne, near Caen, formerly embraced a considerably greater extent ...
— Architectural Antiquities of Normandy • John Sell Cotman

... Valence in Dauphine boasted of possessing the bones of the giant Bucart, the tyrant of the Vivarias, who was slain by his vassal, Count de Cabillon. The Dominicans had the shin-bone and part of the knee-articulation, which, substantiated ...
— Anomalies and Curiosities of Medicine • George M. Gould

... to Angouleme in 1804, on his way to his consulship at Valence, he made the acquaintance of Mme. de Senonches, then Mlle. Zephirine, and had a daughter by her," added Cointet for the attorney's ear——"Yes," he continued, as Petit-Claud gave a start; "yes, and Mlle. Zephirine's marriage with M. de Senoches soon followed the birth of ...
— Eve and David • Honore de Balzac

... especially Perigueux, but it is clear that in others the existence of fine examples of Roman architecture (Fig. 168) affected the design of buildings down to and during the eleventh century. This influence may, for example, be detected in the use, in the churches at Autun, Valence, and Avignon, of capitals, pilasters, and other features closely resembling classic originals, and in the employment through a great part of Central and Northern France ...
— Architecture - Classic and Early Christian • Thomas Roger Smith

... Count Bougart of Valence made war on Count Garin of Beaucaire,—war so great, so marvelous, and so mortal that never a day dawned but always he was there, by the gates and walls and barriers of the town, with a hundred knights, ...
— The Best of the World's Classics, Restricted to Prose, Vol. VII (of X)--Continental Europe I • Various



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