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darmstadtium

(Encyclopedia) darmstadtium, artificially produced radioactive chemical element; symbol Ds; at. no. 110; mass number of most stable isotope 281; m.p., b.p., sp. gr., and valence unknown. Situated in…

Skellefteå

(Encyclopedia) SkellefteåSkellefteåshĕlĕfˈtəōˌ [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…

tartar, dental

(Encyclopedia) tartar, dental, precipitate of saliva that accumulates around teeth at the gum line. Composed primarily of calcium salts, tartar forms as a hard brownish substance that irritates gums…

Arboleda, Julio

(Encyclopedia) Arboleda, JulioArboleda, Julioh&oomacr;ˈlyō ärbōlāˈᵺä [key], 1817–61, Colombian poet and politician. A powerful political force, he was for a time imprisoned and then exiled. He…

Humbert I

(Encyclopedia) Humbert I, 1844–1900, king of Italy (1878–1900), son and successor of Victor Emmanuel II. A soldier by training, Humbert showed interest primarily in military affairs and foreign…