Tungsten

wolframio tungsteno

Tungsten, or wolfram, has the highest melting point of any metal. It becomes a liquid at an abrasive temperature of 3,414 °C. It is a very dense metal, and its name comes from the Swedish phrase for "heavy stone". This metal is generally obtained from the mineral wolframite. A compound consisting of carbon and wolfram called wolfram carbide, it is used to harden objects such as drill bits. Its high melting point allows its use in light bulb filaments. This element is also useful in the production of weights, as well as the sinkers used with fishing hooks.

Summary of properties (W)

Atomic weight183.84(1)
Discoverer (year)Elhuyar, Juan José & Fausto (brother) (1783)
Natural formmetallic solid (body centered cubic)
Electron configuration[Xe] 414 5d4 6s2
Melting point (ºC)3410
Boiling point (ºC)5660
Abundance in earth's crust (ppm)1.3
Isotope (abundance)180W (0.12), 182W (26.50), 183W (14.31), 184W (30.64), 186W (28.43)
Density g/cm319.35
Van der Waals radius (pm)218
Covalent radius (pm)150
Electronegativity (Pauling)2.36
Vaporization enthalpy (kJ/mol)799.10
Enthalpy of fusion (kJ/mol)52.31
Specific heat capacity (J/g·K) at 25ºC and 1 atm0.13
Thermal conductivity (W/cm·K) at 25ºC and 1 atm0.740
Oxidation state+6
Electron affinity (eV)0.82
1st Ionization potential (eV)7.8640

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