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Metal > TungstenW - Tungsten Wolfram, also known as tungsten, is used for lightbulb filiments. Discovered by Swedish pharmacist Karl Scheele in 1781 in the mineral called tungsten (now known as scheelite). Spanish chemists and brothers Don Fausto, and Don Juan del Huyar extracted the pure metal from another mineral, wolframite in 1873. Atomic number - 74 Density g/mL 19 .3 Atomic weight u 183 .85 Melting point K 3680 Bonding radius A 1 .3 Boiling point K 5828 Atomic radius A 2 .02 Heat of vaporization kJ/mol 824 Ionization Potential V 7 .98 Heat of fusion kJ/mol 35 .4 Electronegativity - 2 .36 Specific heat J/gK 0 .13 The oxide is mildly acidic. Crystal are body centered cubic. Electron config. : [Xe] 4f14 5d4 6s2 Definition: When used as an alloying element it increases the strength of steel at normal and elevated temperatures. Its "red hardness" value makes it suitable for cutting tools as it enables the tool edge to be maintained at high temperatures. In conjunction with other alloying elements it finds applications in heat resisting and other severe service conditions.
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