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niobium

(Encyclopedia)niobium nīōˈbēəm [key], metallic chemical element; symbol Nb; at. no. 41; at. wt. 92.90638; m.p. about 2,468℃; b.p. 4,742℃; sp. gr. 8.57 at 20℃; valence +2, +3, +4, or +5. Niobium is a rare...

nonmetal

(Encyclopedia)nonmetal, chemical element possessing certain properties by which it is distinguished from a metal. In general, this distinction is drawn on the basis that a nonmetal tends to accept electrons and for...

medal

(Encyclopedia)medal, a piece of metal, cast or struck, often coin-shaped. The obverse and reverse bear bas-relief and inscription. Commemorative medals are issued in memory of a notable person or event. Civil and m...

Mayne, Thom

(Encyclopedia)Mayne, Thom, 1944–, American architect, b. Waterbury, Conn., grad. Univ. of Southern California (B.A., 1968), Harvard (M.A., 1978). In 1972 Mayne cofounded the firm Morphosis in Santa Monica, Calif....

reed instrument

(Encyclopedia)reed instrument, in music, an instrument whose sound-producing agent is a thin strip of cane, wood, plastic, or metal that vibrates as air is passed over it. The predecessor of these instruments is th...

Vancouver, city, United States

(Encyclopedia)Vancouver, city (1990 pop. 46,380), seat of Clark co., SW Wash., on the Columbia River opposite Portland, Oreg., with which it is connected by bridges; inc. 1857. A rapidly growing suburb of Portland ...

thorium

(Encyclopedia)thorium thôrˈēəm [key] [from Thor], radioactive chemical element; symbol Th; at. no. 90; mass number of most stable isotope 232; m.p. about 1,750℃; b.p. about 4,790℃; sp. gr. 11.7 at 20℃; va...

Drenthe

(Encyclopedia)Drenthe drĕnˈtə [key], province, c.1,030 sq mi (2,670 sq km), NE Netherlands, bordering Ge...

Ironton

(Encyclopedia)Ironton, industrial city (2020 pop. 10,400), seat of Lawrence co., S Ohio, on the Ohio River; inc. as a city 1865. Chemicals, dyes, metal pipes, plastic...

Herford

(Encyclopedia)Herford hĕrˈfôrt [key], city, North Rhine–Westphalia, NW Germany, on the Werre River. It...