Lát'ọwọ́ Wikipedia, ìwé ìmọ̀ ọ̀fẹ́
Wúrà |
79Au
|
|
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 |
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