Wolframyo

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Tungsten
74W
Mo

W

Sg
tantalumtungstenrhenium
Appearance
grayish white, lustrous
General properties
Name, simbolo, kaiphan tungsten, W, 74
Pronunciation Plantilya:IPAc-en Plantilya:Respell;
Plantilya:IPAc-en Plantilya:Respell
Element category puthaw nga transisyon
Group, period, block 66, d
Standard atomic weight 183.84
Electron configuration [Xe] 4f14 5d4 6s2[1]
2, 8, 18, 32, 12, 2
Electron shells of tungsten (2, 8, 18, 32, 12, 2)
History
Discovery Torbern Bergman (1781)
First isolation Juan José Elhuyar and Fausto Elhuyar (1783)
Physical properties
Phase magahi
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
Critical point 13892 K, MPa
Heat of fusion 35.3 kJ·mol−1
Heat of vaporization 806.7 kJ·mol−1
Molar heat capacity 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
Oxidation states 6, 5, 4, 3, 2, 1, 0, −1, −2
(mildly acidic oxide)
Electronegativity 2.36 (Pauling scale)
Ionization energies 1st: 770 kJ·mol−1
2nd: 1700 kJ·mol−1
Atomic radius 139 pm
Covalent radius 162±7 pm
Miscellanea
Crystal structure body-centered cubic
Tungsten has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[2]
Electrical resistivity (20 °C) 52.8 nΩ·m
Thermal conductivity 173 W·m−1·K−1
Thermal expansion (25 °C) 4.5 µm·m−1·K−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
Most stable 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% >1.7×1020 y α 1.772 178Hf
183W 14.31% >8×1019 y α 1.680 179Hf
184W 30.64% >1.8×1020 y α 1.123 180Hf
185W syn 75.1 d β 0.433 185Re
186W 28.43% >4.1×1018 y α 1.656 182Hf
ββ - 186Os
t  h  u
· r

Ang wolframyo (Iningles tungsten) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga W ug kaiphan nga atomik 74. Ang wolframyo mao ang puthaw nga transisyon.

Ang mga gi basihan niini[usba | edit source]

  1. Plantilya:Citeweb
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.


Galeriya sa hulagway[usba | edit source]