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Wúrà |
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Ìhànsójú | metallic yellow |
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Ìwúwo átọ̀mù Ar, std(Au) | 196.966570(4)[1] |
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Wúrà ní orí tábìlì àyè |
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Nọ́mbà átọ̀mù (Z) | 79 |
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Ẹgbẹ́ | group 11 |
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Àyè | àyè 6 |
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Àdìpọ̀ | Àdìpọ̀-d |
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Ẹ̀ka ẹ́límẹ́ntì | Transition metal |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Xe] 4f14 5d10 6s1 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 32, 18, 1 |
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Àwọn ohun ìní ara |
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Ìfarahàn at STP | solid |
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Ìgbà ìyọ́ | 1337.33 K (1064.18 °C, 1947.52 °F) |
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Ígbà ìhó | 3129 K (2856 °C, 5173 °F) |
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Kíki (near r.t.) | 19.30 g/cm3 |
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when liquid (at m.p.) | 17.31 g/cm3 |
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Heat of fusion | 12.55 kJ/mol |
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Heat of | 324 kJ/mol |
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Molar heat capacity | 25.418 J/(mol·K) |
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pressure
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
1646 |
1814 |
2021 |
2281 |
2620 |
3078 |
|
Atomic properties |
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Oxidation states | −3, −2, −1, 0,[2] +1, +2, +3, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment |
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Electronegativity | Pauling scale: 2.54 |
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Atomic radius | empirical: 144 pm |
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Covalent radius | 136±6 pm |
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Van der Waals radius | 166 pm |
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Spectral lines of wúrà |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | Lattice face centered cubic |
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Speed of sound thin rod | 2030 m/s (at r.t.) |
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Thermal expansion | 14.2 µm/(m·K) (at 25 °C) |
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Thermal conductivity | 318 W/(m·K) |
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Electrical resistivity | 22.14 n Ω·m (at 20 °C) |
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Magnetic ordering | diamagnetic |
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Shear modulus | 27 GPa |
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Bulk modulus | 180 GPa |
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Poisson ratio | 0.44 |
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Mohs hardness | 2.5 |
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Vickers hardness | 216 MPa |
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Brinell hardness | ? 2450 MPa |
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CAS Number | 7440-57-5 |
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Main isotopes of wúrà |
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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 |
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Àdàkọ:Category-inline | references |