Wúrà

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Wúrà
79Au
Ag

Au

Rg
platinumwúràmercury
Ìhànsójú
metallic yellow
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà wúrà, Au, 79
Ẹ̀ka ẹ́límẹ̀nti transition metal
Ẹgbẹ́, àsìkò, àdìpò 116, d
Ìwúwo átọ́mù 196.966569(4)
Ìtòléra ẹ̀lẹ́ktrónì [Xe] 4f14 5d10 6s1
2, 8, 18, 32, 18, 1
Physical properties
Phase solid
Density (near r.t.) 19.30 g·cm−3
Liquid density at m.p. 17.31 g·cm−3
Melting point 1337.33 K, 1064.18 °C, 1947.52 °F
Boiling point 3129 K, 2856 °C, 5173 °F
Heat of fusion 12.55 kJ·mol−1
Heat of vaporization 324 kJ·mol−1
Molar heat capacity 25.418 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1646 1814 2021 2281 2620 3078
Atomic properties
Oxidation states -1, 1, 2, 3, 4, 5
(amphoteric oxide)
Electronegativity 2.54 (Pauling scale)
Ionization energies 1st: 890.1 kJ·mol−1
2nd: 1980 kJ·mol−1
Atomic radius 144 pm
Covalent radius 136±6 pm
Van der Waals radius 166 pm
Miscellanea
Crystal structure lattice face centered cubic
Wúrà has a Lattice face centered cubic crystal structure
Magnetic ordering diamagnetic
Electrical resistivity (20 °C) 22.14 nΩ·m
Thermal conductivity 318 W·m−1·K−1
Thermal expansion (25 °C) 14.2 µm·m−1·K−1
Speed of sound (thin rod) (r.t.) 2030 m·s−1
Tensile strength 120 MPa
Shear modulus 27 GPa
Bulk modulus 180 GPa
Poisson ratio 0.44
Mohs hardness 2.5
Vickers hardness 216 MPa
Brinell hardness  ? 2450 MPa
CAS registry number 7440-57-5
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù wúrà
iso NA half-life DM DE (MeV) DP
195Au syn 186.10 d ε 0.227 195Pt
196Au syn 6.183 d ε 1.506 196Pt
β 0.686 196Hg
197Au 100% 197Au is stable with 118 neutrons
198Au syn 2.69517 d β 1.372 198Hg
199Au syn 3.169 d β 0.453 199Hg
· r


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