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Chemical element with atomic number 74Àdàkọ:SHORTDESC:Chemical element with atomic number 74
Tungsten, 74 W Tungsten Pípè / ˈ t ʌ ŋ s t ən / (TUNG -stən ) Ìhànsójú grayish white, lustrous Ìwúwo átọ̀mù A r, std (W) 183.84(1) [1] Tungsten ní orí tábìlì àyè
Nọ́mbà átọ̀mù (Z ) 74 Ẹgbẹ́ group 6 Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò ẹ̀lẹ́ktrọ́nù [Xe ] 4f14 5d4 6s2 [2] Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan 2, 8, 18, 32, 12, 2 Àwọn ohun ìní ara Ìfarahàn at STP solid Ìgbà ìyọ́ 3695 K (3422 °C, 6192 °F) Ígbà ìhó 5828 K (5555 °C, 10031 °F) Kíki (near r.t. ) 19.25 g/cm3 when liquid (at m.p. ) 17.6 g/cm3 Critical point 13892 K, MPa Heat of fusion 52.31 kJ/mol Heat of 806.7 kJ/mol Molar heat capacity 24.27 J/(mol·K) 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 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment Electronegativity Pauling scale: 2.36 Atomic radius empirical: 139 pm Covalent radius 162±7 pm Color lines in a spectral range Spectral lines of tungsten Other properties Natural occurrence primordial Crystal structure (bcc) Thermal expansion 4.5 µm/(m·K) (at 25 °C) Thermal conductivity 173 W/(m·K) Electrical resistivity 52.8 n Ω·m (at 20 °C) Magnetic ordering paramagnetic[3] 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 Number 7440-33-7 Main isotopes of tungsten
Isotope
Abundance
Half-life (t 1/2 )
Decay mode
Product
180 W
0.12%
1.8×1018 y
α
2.516
176 Hf
181 W
syn
121.2 d
ε
0.188
181 Ta
182 W
26.50%
182 W is stable with 108 neutrons
183 W
14.31%
183 W is stable with 109 neutrons
184 W
30.64%
184 W is stable with 110 neutrons
185 W
syn
75.1 d
β−
0.433
185 Re
186 W
28.43%
186 W is stable with 112 neutrons
Àdàkọ:Category-inline | references
Itokasi
↑ 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.
↑ Magnetic susceptibility of the elements and inorganic compounds , in Handbook of Chemistry and Physics 81st edition, CRC press.
↑ "Why does Tungsten not 'Kick' up an electron from the s sublevel ?" . Retrieved 2008-06-15 .
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