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Niterói

(Encyclopedia)Niterói nētəroiˈ [key], city (1996 pop. 450,124), Rio de Janeiro prov., SE Brazil, on Guanabara Bay opposite the city of Rio de Janeiro. It is a residential suburb of Rio, and many of its citizens...

Autun

(Encyclopedia)Autun ōtöNˈ [key], town, Saône-et-Loire dept., E central France, on the Arroux River. It is an industrial center producing metals, machinery, leather, cloth, timber, a...

Opole

(Encyclopedia)Opole ôpôˈlĕ [key], Ger. Oppeln, city (1992 est. pop. 129,000), capital of Opolskie prov., S Poland, on the Oder River. A river port and rail junction, it is also an important trade center, with m...

Bassano del Grappa

(Encyclopedia)Bassano del Grappa bäs-säˈnō dĕl gräpˈpä [key], city, Venetia, NE Italy, on t...

carbon tetrachloride

(Encyclopedia)carbon tetrachloride tĕˌtrəklôrˌəmĕthˈān [key], CCl4, colorless, poisonous, liquid organic compound that boils at 76.8℃. It is toxic when absorbed through the skin or when inhaled. It react...

element

(Encyclopedia)CE5 element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means o...

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...

Mudéjar

(Encyclopedia)Mudéjar mo͞oᵺāˈhär [key], name given to the Moors who remained in Spain after the Christian reconquest but were not converted to Christianity, and to the style of Spanish architecture and decor...

Irkutsk

(Encyclopedia)Irkutsk ĭrko͞otskˈ [key], city (1989 pop. 626,000), capital of Irkutsk region, S Siberian Russia, at the confluence of the Angara and Irkut rivers. It is an industrial center, a port, the site of a...

chelating agents

(Encyclopedia)chelating agents kēˈlātĭng [key]. Certain organic compounds are capable of forming coordinate bonds (see chemical bond) with metals through two or more atoms of the organic compound; such organic ...