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Aymer of Valence

(Encyclopedia)Aymer of Valence āˈmər, vəlĕnsˈ, väläNsˈ [key], d. 1260, bishop of Winchester; son of Isabella (widow of King John of England) and Hugh X, count of La Marche. He was thus half-brother of King...

Aymer of Valence, earl of Pembroke

(Encyclopedia)Aymer of Valence, earl of Pembroke: see Pembroke, Aymer de Valence, earl of. ...

Pembroke, Aymer de Valence, earl of

(Encyclopedia)Pembroke, Aymer de Valence, earl of pĕmˈbro͝ok [key], d. 1324, English nobleman; nephew of Aymer of Valence, bishop of Winchester. He succeeded his father, William, half-brother of Henry III, as ea...

Æthelmar of Valence

(Encyclopedia)Æthelmar of Valence: see Aymer of Valence. ...

Valence, city, France

(Encyclopedia)Valence väläNsˈ [key], city (1990 pop. 65,026), capital of Drôme dept., SE France, in Dauphiné, on the Rhône River. Its many manufactures include metallurgical products, textiles, leather goods,...

valence, in chemistry

(Encyclopedia)valence, combining capacity of an atom expressed as the number of single bonds the atom can form or the number of electrons an element gives up or accepts when reacting to form a compound. Atoms are c...

equivalent weight

(Encyclopedia)equivalent weight. The equivalent weight of an element or radical is equal to its atomic weight or formula weight divided by the valence it assumes in compounds. The unit of equivalent weight is the a...

oxidation number

(Encyclopedia)oxidation number or oxidation state: see valence. ...

copper sulfate

(Encyclopedia)copper sulfate, common name for the blue crystalline heptahydrate of cupric sulfate, in which copper has valence +2. It may also refer to cuprous sulfate (Cu2SO4), in which copper has valence +1. ...

Edward II

(Encyclopedia)Edward II, 1284–1327, king of England (1307–27), son of Edward I and Eleanor of Castile, called Edward of Carnarvon for his birthplace in Wales. When trouble threatened with the new king of Fran...