Wúrà, 79 Au Wúrà Ìhànsójú metallic yellow Ìwúwo átọ̀mù A r, std (Au) 196.9665 70(4) Wúrà ní orí tábìlì àyè Nọ́mbà átọ̀mù (Z ) 79 Ẹgbẹ́ group 11 Àyè àyè 6 Àdìpọ̀ Àdìpọ̀-d Ẹ̀ka ẹ́límẹ́ntì Transition metalÌtò 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 Color lines in a spectral range Spectral lines of wúrà Other properties Natural occurrence primordial Crystal structure Lattice face centered cubic
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 (t 1/2 ) Decay mode Product 195 Au syn 186.10 d ε 0.227 195 Pt 196 Au syn 6.183 d ε 1.506 196 Pt β− 0.686 196 Hg 197 Au 100% 197 Au is stable with 118 neutrons 198 Au syn 2.69517 d β− 1.372 198 Hg 199 Au syn 3.169 d β− 0.453 199 Hg
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