Tungsten

Tungsten, a metal element. Atomic number 74, the atomic weight of 183.84. Gray or silver steel, high hardness, high melting point, room temperature is not corroded by air; Main use for manufacturing filament and high speed cutting steel, hard mold, also used in optical instruments, chemical instrument. China is the world's largest tungsten deposit. Tungsten is a metal elements. Tungsten chemical symbol W, atomic number is 74, the relative atomic mass is 183.85, the atomic radius of 137 meters, the density of 19.35 g/per cubic centimeter, belongs to the periodic table 6 cycles of VIB (second) for a long period of time. Tungsten hexavalent cation in nature mainly, the ionic radius of 0.68 x 10-10 m. Due to the small W6 + ion radius, electricity price is high, the polarization ability strong, easy to form the complex anion, thus tungsten is mainly in the form of complex anion (WO4) 2 -, and solution of Fe2 +, Mn2 + and Ca2 + cation form black tungsten or scheelite ore precipitation. After refining tungsten is silvery white, shiny metal, high melting point, hardness is very big, very low vapor pressure, evaporation rate and small, are more stable chemical properties.

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Steel tubular zinc,