Wúrà

Wúrà, ₇₉Au

Wúrà
Ìhànsójú	metallic yellow
Ìwúwo átọ̀mù Ar, std(Au)	196.966570(4)
Wúrà 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 Ag ↑ Au ↓ Rg platinum ← wúrà → mercury
Nọ́mbà átọ̀mù (Z)	79
Ẹgbẹ́	group 11
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f14 5d10 6s1
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 18, 1
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	1337.33 K ​(1064.18 °C, ​1947.52 °F)
Ígbà ìhó	3129 K ​(2856 °C, ​5173 °F)
Kíki (near r.t.)	19.30 g/cm3
when liquid (at m.p.)	17.31 g/cm3
Heat of fusion	12.55 kJ/mol
Heat of	324 kJ/mol
Molar heat capacity	25.418 J/(mol·K)
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	−3, −2, −1, 0, +1, +2, +3, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 2.54
Atomic radius	empirical: 144 pm
Covalent radius	136±6 pm
Van der Waals radius	166 pm
Spectral lines of wúrà
Other properties
Natural occurrence	primordial
Crystal structure	​Lattice face centered cubic Lattice face centered cubic crystal structure for wúrà
Speed of sound thin rod	2030 m/s (at r.t.)
Thermal expansion	14.2 µm/(m·K) (at 25 °C)
Thermal conductivity	318 W/(m·K)
Electrical resistivity	22.14 n Ω·m (at 20 °C)
Magnetic ordering	diamagnetic
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 Number	7440-57-5
Main isotopes of wúrà
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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