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Cookeville

(Encyclopedia)Cookeville, city (2020 pop. 34,842), seat of Putnam co., N central Tenn.; inc. 1854. It is a farm trade center that also produces transportation equipme...

McKees Rocks

(Encyclopedia)McKees Rocks, borough (1990 pop. 7,691), Allegheny co., SW Pa., an industrial suburb of Pittsburgh, on the Ohio River; settled c.1764, inc. 1892. Manufacturing includes metal and food products, lubric...

Lee's Summit

(Encyclopedia)Lee's Summit, city (1990 pop. 46,418), Jackson co., W Mo., in the Kansas City metropolitan area; inc. 1868. The city is an important trucking center and manufactures communications equipment, applianc...

Saint Francis, city, United States

(Encyclopedia)Saint Francis, city (1990 pop. 9,245), Milwaukee co., SE Wis., a residential suburb of Milwaukee on Lake Michigan; inc. 1951. There is meat processing and the manufacture of plastic and metal products...

cobalt, chemical element

(Encyclopedia)cobalt, metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495℃; b.p. about 2,870℃; sp. gr. 8.9 at 20℃; valence +2 or +3. Cobalt is a silver-white, lustrous, hard, brittle...

cadmium

(Encyclopedia)cadmium kădˈmēəm [key] [from cadmia, Lat. for calamine, with which cadmium is found associated], metallic chemical element; symbol Cd; at. no. 48; at. wt. 112.411; m.p. 321℃; b.p. 765℃; sp. gr...

bismuth

(Encyclopedia)bismuth bĭzˈməth [key] [Ger. Weisse Masse=white mass], metallic chemical element; symbol Bi; at. no. 83; at. wt. 208.98040; m.p. 271.3℃; b.p. about 1,560℃; sp. gr. 9.75 at 20℃; valence +3 or ...

rare-earth metals

(Encyclopedia)rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and usually yttrium, sometimes scandium and thorium, and rarely zirconium. Promethium, whi...

scandium

(Encyclopedia)scandium skănˈdēəm [key], metallic chemical element; symbol Sc; at. no. 21; at. wt. 44.95591; m.p. 1,541℃; b.p. 2,831℃; sp. gr. 2.99 at 20℃; valence +3. Scandium is a soft silver-white metal...

samarium

(Encyclopedia)samarium səmârˈēəm [key], metallic chemical element; symbol Sm; at. no. 62; at. wt. 150.36; m.p. 1,072℃; b.p. 1,791℃; sp. gr. 7.54 at 20℃; valence +2 or +3. Samarium is a lustrous silver-wh...