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ytterbium

(Encyclopedia)ytterbium ĭtûrˈbēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Yb; at. no. 70; at. wt. 173.054; m.p. 819℃; b.p. about 1,194℃; sp. gr. about 7.0; valence +2 or +3...

terbium

(Encyclopedia)terbium tûrˈbēəm [key] [from Ytterby, a village in Sweden], metallic chemical element; symbol Tb; at. no. 65; at. wt. 158.92535; m.p. 1,356℃; b.p. 3,123℃; sp. gr. about 8.25; valence +3 or +4....

thulium

(Encyclopedia)thulium tho͞oˈlēəm [key] [from Thule, an ancient name for Scandinavia], metallic chemical element; symbol Tm; at. no. 69; at. wt. 168.93421; m.p. about 1,545℃; b.p. 1,947℃; sp. gr. 9.3; valenc...

silica

(Encyclopedia)silica or silicon dioxide, chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white. It occurs in sev...

isotope

(Encyclopedia)CE5 Isotopes of hydrogen isotope īˈsətōp [key], in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of ...

periodic table

(Encyclopedia)CE5 periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arrange...

East Chicago

(Encyclopedia)East Chicago, city (2020 pop. 26,370), Lake co., extreme NW Ind., on Lake Michigan, in the industrialized Calumet region, ad...

antihistamine

(Encyclopedia)antihistamine ănˌtĭhĭsˈtəmēn [key], any one of a group of compounds having various chemical structures and characterized by the ability to antagonize the effects of histamine. Their principal u...

Anniston

(Encyclopedia)Anniston ănˈĭstən [key], city, seat of Calhoun co., NE Ala., in a mining region of the Appalachian foothills; inc. 1873. Its manufactures include soil pipes, textiles,...

Guiyang

(Encyclopedia)Guiyang or Kweiyang both: gwā-yäng [key], city (1994 est. pop. 1,131,200), capital of Guizhou prov., SW China. On the main road from Kunming to Chongqing, it is also a rail (since 1959) and industri...