Tungsten, 74 W Tungsten Pronunciation (TUNG -stən ) Alternative name wolfram, pronounced: (WUUL -frəm ) Appearance grayish white, lustrous Standard atomic weight A r, std (W) 183.84(1)[1] Tungsten in the periodic table
Atomic number (Z ) 74 Group group 6 Period period 6 Block d-block Element category d-block Electron configuration [Xe ] 4f14 5d4 6s2 [2] Electrons per shell 2, 8, 18, 32, 12, 2 Physical properties Phase at STP solid Melting point 3695 K (3422 °C, 6192 °F) Boiling point 6203 K (5930 °C, 10706 °F) Density (near r.t. ) 19.3 g/cm3 when liquid (at m.p. ) 17.6 g/cm3 Heat of fusion 52.31 kJ/mol [3] [4] Heat of vaporization 774 kJ/mol Molar heat capacity 24.27 J/(mol·K) 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 −4, −2, −1, 0, +1, +2, +3, +4 , +5, +6 (a mildly acidic oxide) Electronegativity Pauling scale: 2.36 Ionization energies 1st: 770 kJ/mol 2nd: 1700 kJ/mol Atomic radius empirical: 139 pm Covalent radius 162±7 pm Spectral lines of tungstenOther properties Natural occurrence primordial Crystal structure body-centered cubic (bcc) Speed of sound thin rod 4620 m/s (at r.t. ) (annealed) Thermal expansion 4.5 µm/(m·K) (at 25 °C) Thermal conductivity 173 W/(m·K) Electrical resistivity 52.8 nΩ·m (at 20 °C) Magnetic ordering paramagnetic [5] Magnetic susceptibility +59.0·10−6 cm3 /mol (298 K)[6] Young's modulus 411 GPa Shear modulus 161 GPa Bulk modulus 310 GPa Poisson ratio 0.28 Mohs hardness 7.5 Vickers hardness 3430–4600 MPa Brinell hardness 2000–4000 MPa CAS Number 7440-33-7 History Discovery and first isolationJuan José Elhuyar and Fausto Elhuyar [7] (1783)Named by Torbern Bergman (1781) Main isotopes of tungsten
Category: Tungsten view · talk · edit
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W
data m.p. cat
in
calc from C
diff
report
ref
C
3422
—
—
K
3695
3695
0
F
6192
6192
0
max precision
0
WD
input
C: 3422, K: 3695, F: 6192
comment
W
data b.p. cat
in
calc from C
diff
report
ref
C
5930
—
—
K
6203
6200
3
delta
F
10706
10710
-4
delta
max precision
0
WD
input
C: 5930, K: 6203, F: 10706
comment
References
These references will appear in the article, but this list appears only on this page.
↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al . (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi :10.1515/pac-2015-0305 .
↑ Berger, Dan. "Why does Tungsten not 'Kick' up an electron from the s sublevel ?" . Bluffton College, USA. http://www.madsci.org/posts/archives/2000-02/951518136.Ch.r.html .
↑ Lide, David R., ed (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida : CRC Press . p. 6-134. ISBN 978-1-4200-9084-0 .
↑ Tolias P. (2017). "Analytical expressions for thermophysical properties of solid and liquid tungsten relevant for fusion applications". Nuclear Materials and Energy 13 : 42–57. doi :10.1016/j.nme.2017.08.002 . Bibcode : 2017arXiv170306302T .
↑ Lide, D. R., ed (2005). "Magnetic susceptibility of the elements and inorganic compounds" . CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 978-0-8493-0486-6 . https://web.archive.org/web/20110303222309/http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf .
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics . Boca Raton, Florida: Chemical Rubber Company Publishing. p. E110. ISBN 978-0-8493-0464-4 .
↑ "Tungsten" . Royal Society of Chemistry . https://www.rsc.org/periodic-table/element/74/tungsten .
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