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nickel

(Encyclopedia)nickel, metallic chemical element; symbol Ni; at. no. 28; at. wt. 58.6934; m.p. about 1,453℃; b.p. about 2,732℃; sp. gr. 8.902 at 25℃; valence 0, +1, +2, +3, or +4. Nickel is a hard, malleable, ...

Charles II, emperor of the West and king of the West Franks

(Encyclopedia)Charles II or Charles the Bald, 823–77, emperor of the West (875–77) and king of the West Franks (843–77); son of Emperor Louis I by a second marriage. The efforts of Louis to create a kingdom f...

astatine

(Encyclopedia)astatine ăsˈtətēn, –tĭn [key] [Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302℃ (estimated); b.p. 337℃ (estima...

fermium

(Encyclopedia)fermium fûrˈmēəm [key] [for Enrico Fermi], artificially produced radioactive chemical element; symbol Fm; at. no. 100; mass no. of most stable isotope 257; m.p. 1,527℃; b.p. and sp. gr. unknown;...

Declaration of the Rights of Man and Citizen

(Encyclopedia)Declaration of the Rights of Man and Citizen, a fundamental document of French constitutional history, drafted by Emmanuel Sieyès, adopted by the Constituent Assembly on Aug. 26, 1789, and embodied i...

Wolcott, Oliver, signer of the Declaration of Independence

(Encyclopedia)Wolcott, Oliver, 1726–97, political leader in the American Revolution, signer of the Declaration of Independence, b. South Windsor (then in Windsor), Conn.; son of Roger Wolcott. He fought in King G...

Regents of the University of California v. Bakke

(Encyclopedia)Regents of the University of California v. Bakke, case decided in 1978 by the U.S. Supreme Court. The Court held in a closely divided decision that race could be one of the factors considered in choos...

yttrium

(Encyclopedia)yttrium ĭtˈrēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.90585; m.p. about 1,522℃; b.p. 3,338℃; sp. gr. about 4.45; valence +3. Yttriu...

Pontics

(Encyclopedia)Pontics, mountain system, N Turkey, extending c.700 mi (1,100 km) along the southern coast of the Black Sea. The Pontics generally increase in height from west to east, culminating in Kaçkar Daği (1...

lutetium

(Encyclopedia)lutetium, formerly lutecium both: lo͞otēˈshēəm [key], metallic chemical element; symbol Lu; atomic number 71; at. wt. 174.9668; m.p. about 1,663℃; b.p. about 3,395℃; sp. gr. 9.835 at 25℃; v...