Wúrà

Wúrà
79Au
Ag ↑ Au ↓ Rg Tábìlì ìdásìkò platinum ← wúrà → mercury
Ìhànsójú
metallic yellow
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	wúrà, Au, 79
Ẹ̀ka ẹ́límẹ̀nti	transition metal
Ẹgbẹ́, àsìkò, àdìpò	11, 6, 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
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