广东快乐十分开奖结果

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W

Tungsten广东快乐十分开奖结果, also called wolfram, is a chemical element that has the symbol W (German: Wolfram) and atomic number 74. A very hard, heavy, steel-gray to white transition metal, tungsten is found in several ores including wolframite and scheelite and is remarkable for its robust physical properties, especially the fact that it has the highest melting point of all the non-alloyed metals and the second highest of all the elements after carbon. The pure form is used mainly in electrical applications but its many compounds and alloys are widely used in many applications, most notably in light bulb filaments, in X-ray tubes (as both the filament and target), and in superalloys. Tungsten is the only metal from the third transition series that is known to occur in biomolecules.

TECHNICAL DATA
SymbolWDensity (20°C)/gcm3319.3
Atomic number74Melting point /°C-3380
No. of naturally occurring isotopes5Boiling point /°C-5500
Atomic weight183.85(+/-0.03)ΔHfus/kJmol-1-35
Electronic configuration[Xe]4f145d46s1ΔHvap/kJmol-1824(+/-21)
Metal radius(12-coordinate)/pm139ΔHf(monoatomic gas)/kJmol-1849(+/-13)
Ionic radius(6-coordinate)/pm VI60Ionization energy/kJmol-1 I770
Ionic radius(6-coordinate)/pm V62Ionization energy/kJmol-1 II1700
Ionic radius(6-coordinate)/pm IV66Ionization energy/kJmol-1 III2300
Electrical resistivity (20°C)/μohm cm~5Electronegativity χ1.7
EVAPORATION TECHNIQUES
Temperature (oC) @Vap. PressureTechniquesRemarks
10-8 Torr10-6 Torr10-4 TorrElectron BeamCrucibleCoilBoat
211724072757Good---Forms volatile oxides. Films hard & adherent




W
Sputtering Targets
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.K           g/cc
Tungsten_WW7417419.3
Evaporation Materials
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.Kg/cc
W ( pellets & pieces)W7417419.3


Below is the periodic table of chemical elements.The elements in red are the ones Nexteck's product contain. Click them, you will come to the details.

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