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
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
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