Chemistry Quick Facts
Google
 
 
Element Properties
   By Name
  By Atomic Number
  By Density
  Melting & Boiling Point
  Electron Configuration
  Radioactive Elements
  Noble & Precious Metals
Periodic Table
Groups
   Periodic Table
  Alkali Metals
  Alkaline Earth Metals
  Halogens
  Noble (Inert) Gases
  Rare Earth Elements
  Transition Metals
  Metalloids (Semimetals)
  Nonmetals
  Poor Metals
Materials
   Toxic Substances
  Semiconductor Materials
  Vitamins
  Amino Acids
Inventions
& Patents
Reference


Tungsten (Wolfram)
Chemical Properties & Compounds



Symbol Atomic Number Atomic Weight Melting Point Boiling Point Phase Density Classification
W 74 183.84 3422 °C 5555 °C Solid 19.25 g/cm3 Metal


74 tantalum ← tungsten → rhenium
Mo
↑
W
↓
Sg
General
Name, Symbol, Number tungsten, W, 74
Chemical series transition metals
Group, Period, Block 6, 6, d
Appearance grayish white, lustrous
Standard atomic weight 183.84(1)  g·mol−1
Electron configuration [Xe] 4f14 5d4 6s2
Electrons per shell 2, 8, 18, 32, 12, 2
Physical properties
Phase solid
Density (near r.t.) 19.25  g·cm−3
Liquid density at m.p. 17.6  g·cm−3
Melting point 3695 K
(3422 °C, 6192 °F)
Boiling point 5828 K
(5555 °C, 10031 °F)
Heat of fusion 52.31  kJ·mol−1
Heat of vaporization 806.7  kJ·mol−1
Heat capacity (25 °C) 24.27  J·mol−1·K−1
Vapor pressure
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 3477 3773 4137 4579 5127 5823
Atomic properties
Crystal structure cubic body centered
Oxidation states 6, 5, 4, 3, 2, 1, 0, −1
(mildly acidic oxide)
Electronegativity 2.36 (scale Pauling)
Ionization energies 1st: 770 kJ/mol
2nd: 1700 kJ/mol
Atomic radius 135  pm
Atomic radius (calc.) 193  pm
Covalent radius 146  pm
Miscellaneous
Magnetic ordering no data
Electrical resistivity (20 °C) 52.8 n Ω·m
Thermal conductivity (300 K) 173  W·m−1·K−1
Thermal expansion (25 °C) 4.5  µm·m−1·K−1
Speed of sound (thin rod) (r.t.) (annealed)
4620  m·s−1
Young's modulus 411  GPa
Shear modulus 161  GPa
Bulk modulus 310  GPa
Poisson ratio 0.28
Mohs hardness 7.5
Vickers hardness 3430  MPa
Brinell hardness 2570  MPa
CAS registry number 7440-33-7
Selected isotopes
Main article: Isotopes of tungsten
iso NA half-life DM DE (MeV) DP
180W 0.12% 1.8×1018 y α 2.516 176Hf
181W syn 121.2 d ε 0.188 181Ta
182W 26.50% W is stable with 108 neutrons
183W 14.31% W is stable with 109 neutrons
184W 30.64% W is stable with 110 neutrons
185W syn 75.1 d β- 0.433 185Re
186W 28.43% W is stable with 112 neutrons
References
Tungsten Compounds

Source: Wikipedia article Tungsten


Privacy   Disclaimer   Contact   About    Site Map   Home

Last updated: October 2007

Copyright © 2006-2007 Patent-Invent.com