Periodic Table of the Elements: VanadiumAtomic Number:23Atomic Symbol:VVanadiumAtomic Weight:50.9415ElectronConfiguration:2 · 8 · 11 · 2

V, 22d letter of the alphabet (see U). It is a usual symbol for a voiced labiodental spirant, as in the English vat. In Roman numerals it corresponds to Arabic 5. In chemistry V is the symbol ...

Roscoe, Sir Henry Enfield, 1833–1915, English chemist. He was professor (1857–87) at Owens College, Manchester. He is known for his work, with R. W. Bunsen, in photochemistry and for his study...

Cerro de Pasco, city (1991 pop. 30,000), capital of Pasco dept., central Peru. At an altitude of 13,973 ft (4,259 m), it is one of the highest cities in the world. Cerro de Pasco is noted for ...

Tanzanite, beautiful gemstone discovered in 1967 in the Umba Valley near the Usambara Mts. in Tanzania, a precious variety of the mineral zoisite, a calcium aluminum silicate. Zoisite is a com...

Adirondack Mountains, mountain mass, NE N.Y., between the St. Lawrence valley in the north and the Mohawk valley in the south; rising to 5,344 ft (1,629 m) at Mt. Marcy, the highest point in t...

Kerch, city (1989 pop. 174,000), in Ukraine, in the Crimea. It lies on the Kerch Strait of the Black Sea and at the eastern end of the Kerch Peninsula, a strip of land between the Sea of Azov ...

Shanxi or Shansi, province (1994 est. pop. 29,910,000), c.60,000 sq mi (155,400 sq km), NE China. The capital is Taiyuan. It is bounded on the west and the south by the Huang He (Yellow River)...

Catalyst, substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing of the reaction rate by use of a catalyst is called c...

Sulfuric acid, chemical compound, H2SO4, colorless, odorless, extremely corrosive, oily liquid. It is sometimes called oil of vitriol. When heated, the pure 100% acid loses sulfur trioxide gas...