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Cb

(Encyclopedia)Cb, formerly the symbol for the element columbium, now called niobium (Nb). ...

(Encyclopedia)Skellefteå shĕlĕfˈtəōˌ [key], city (1990 pop. 31,050), Västerbotten co., NE Sweden, on the Skellefteälven River inland from its mouth on the Gulf of Bothnia. The center of a rich mining regio...

actinide series

(Encyclopedia)actinide series, a series of radioactive metallic elements in Group 3 of the periodic table. Members of the series are often called actinides, although actinium (at. no. 89) is not always considered a...

Öskemen

(Encyclopedia)Öskemen o͝ostˌ-kəmyĭnəgôrskˈ [key], city (1989 pop. 324,478), NE Kazakhstan, on the Irtysh River and in the foothills of the W Altai Mts. It is a river port and an industrial center with zinc,...

Nordland

(Encyclopedia)Nordland nôrˈlän, no͝orˈ– [key], county (1995 pop. 241,420), 14,798 sq mi (38,327 sq km), N central Norway, bordering on the Norwegian Sea in the west and on Sweden in the east. The chief towns...

plumbing

(Encyclopedia)plumbing, piping systems inside buildings for water supply and sewage. The Romans had a highly developed plumbing system; water was brought to Rome by aqueducts and distributed to homes in lead pipes�...

barium

(Encyclopedia)barium bârˈēəm [key] [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.327; m.p. 725℃; b.p. 1,640℃; sp. gr. 3.5 at 20℃; valence +2. Barium is a soft, silver-white, ...