Wolframu

Tungsten, ₇₄W

Tungsten
Pípè	/ˈtʌŋstən/ ​(TUNG-stən)
Ìhànsójú	grayish white, lustrous
Ìwúwo átọ̀mù Ar, std(W)	183.84(1)[1]
Tungsten ní orí tábìlì àyè
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mo ↑ W ↓ Sg tantalum ← tungsten → rhenium
Nọ́mbà átọ̀mù (Z)	74
Ẹgbẹ́	group 6
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò 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 (t1/2) Decay mode Pro­duct 180W 0.12% 1.8×1018 y α 2.516 176Hf 181W syn 121.2 d ε 0.188 181Ta 182W 26.50% 182W is stable with 108 neutrons 183W 14.31% 183W is stable with 109 neutrons 184W 30.64% 184W is stable with 110 neutrons 185W syn 75.1 d β− 0.433 185Re 186W 28.43% 186W is stable with 112 neutrons
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