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Arras
(Encyclopedia) Arras Arras äräsˈ [key], city, capital of Pas-de-Calais dept., and historic capital of Artois, N France, on the canalized Scarpe River. It is a…white lead
(Encyclopedia) white lead, heavy, white substance, poisonous, insoluble in water, extensively used as a white pigment and base in paints. It is one of the oldest paint pigments used by humans.…Poznań
(Encyclopedia) PoznańPoznańpôzˈnänyə [key], Ger. PosenPoznańpōˈzən [key], city (1994 est. pop. 589,300), capital of Weilkopolskie prov., W central Poland, port on the Warta River. It is an important…phosphoric acid
(Encyclopedia) phosphoric acid, any one of three chemical compounds made up of phosphorus, oxygen, and hydrogen (see acids and bases). The most common, orthophosphoric acid, H3PO4, is usually simply…vanadium
(Encyclopedia) vanadiumvanadiumvənāˈdēəm [key], metallic chemical element; symbol V; at. no. 23; at. wt. 50.9415; m.p. about 1,890℃; b.p. 3,380℃; sp. gr. about 6 at 20℃; valence +2, +3, +4, or +5.…Wrangel Island
(Encyclopedia) Wrangel Island or Wrangell IslandWrangel Islandrăngˈgəl [key], Rus. Ostrov Vrangelya, island, 1,740 sq mi (4,507 sq km), in the Arctic Ocean, between the East Siberian Sea and the…Tripoli , city, Lebanon
(Encyclopedia) TripoliTripolitrĭpˈəlē [key] or TarabulusTripolitäräbˈ&oobreve;l&oobreve;s [key], ancient Tripolis, city (1996 est. pop. 300,000), NW Lebanon, on the Mediterranean Sea. Citrus…polonium
(Encyclopedia) poloniumpoloniumpəlōˈnēəm [key], radioactive chemical element; symbol Po; at. no. 84; mass no. of most stable isotope 209; m.p. 254℃; b.p. 962℃; sp. gr. about 9.4; valence +2 or +4.…iodine
(Encyclopedia) iodineiodineīˈədīn, –dĭn [key] [Gr.,=violet], nonmetallic chemical element; symbol I; at. no. 53; at. wt. 126.90447; m.p. 113.5℃; b.p. 184.35℃; sp. gr. 4.93 at 20℃; valence −1, +1, +3…helium
(Encyclopedia) heliumheliumhēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density…Trending
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