Wolframyo

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.

Tungsten
74W
Mo ↑ W ↓ Sg Periodic table tantalum ← tungsten → rhenium
Panagway
grayish white, lustrous
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	tungsten, W, 74
Paglitok	/ˈtʌŋstən/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-stən]]; /ˈwʊlfrəm/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-frəm]]
Kategoriyang elemento	puthaw nga transisyon
Group, period, block	6, 6, d
Gibug-aton sa atomo	183.84
Kontorno sa elektron	[Xe] 4f14 5d4 6s2[1] 2, 8, 18, 32, 12, 2 Electron shells of tungsten (2, 8, 18, 32, 12, 2)
History
Pagkadiskobre	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
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 β−β− - 186Os
v t e · r