Or
79
Au
Grup
11
Període
6
Bloc
d
Protons
Electrons
Neutrons
79
79
118
Propietats Generals
Nombre atòmic
79
Massa atòmica
196,966569
Nombre de massa
197
Categoria
Metalls de transició
Color
Or
Radioactiu
No
From the Latin word aurum meaning gold
Estructura cristal·lina
Cara cúbica centrada
Història
Gold has been known since prehistoric times and was the first metal used by humans.
Gold artifacts dated to 5000 years ago have been found in Egyptian tombs.
Gold of 98% purity has been found in Nahal Qunah in the ancient kingdom of Israel, dating from about 6000 years ago.
Gold artifacts dated to 5000 years ago have been found in Egyptian tombs.
Gold of 98% purity has been found in Nahal Qunah in the ancient kingdom of Israel, dating from about 6000 years ago.
Electrons per capa
2, 8, 18, 32, 18, 1
Configuració electrònica
[Xe] 4f14 5d10 6s1
India is the world's largest single consumer of gold
Propietats Físiques
Fase
Sòlid
Densitat
19,282 g/cm3
Punt de fusió
1337,35 K | 1064,2 °C | 1947,56 °F
Punt d'ebullició
3129,15 K | 2856 °C | 5172,8 °F
Entalpia de fusió
12,5 kJ/mol
Entalpia de vaporització
330 kJ/mol
Capacitat tèrmica específica
0,129 J/g·K
Abundància a l'escorça terrestre
3,1×10-7%
Abundància a l'univers
6×10-8%
Crèdits de les imatges: Wikimedia Commons (Alchemist-hp)
Synthetic made gold crystals by the chemical transport reaction in chlorine gas
Número CAS
7440-57-5
Número CID de PubChem
23985
Propietats Atòmiques
Radi atòmic
144 pm
Radi covalent
136 pm
Electronegativitat
2,54 (Escala de Pauling)
Potencial d'ionització
9,2255 eV
Volum atòmic
10,2 cm3/mol
Conductivitat tèrmica
3,17 W/cm·K
Estats d'oxidació
-1, 1, 2, 3, 5
Aplicacions
Gold is used in coinage and is a standard for monetary systems in many countries.
It is also extensively used for jewelry, decoration, dental work, and for plating.
Gold is used widely in microelectronic circuits to ensure reliable, corrosion-resistant and static-free performance.
Gold leaf, flake or dust is used in some gourmet foods as decorative ingredient.
It is also extensively used for jewelry, decoration, dental work, and for plating.
Gold is used widely in microelectronic circuits to ensure reliable, corrosion-resistant and static-free performance.
Gold leaf, flake or dust is used in some gourmet foods as decorative ingredient.
Gold is considered to be non-toxic
Isòtops
Isòtops estables
197AuIsòtops inestables
169Au, 170Au, 171Au, 172Au, 173Au, 174Au, 175Au, 176Au, 177Au, 178Au, 179Au, 180Au, 181Au, 182Au, 183Au, 184Au, 185Au, 186Au, 187Au, 188Au, 189Au, 190Au, 191Au, 192Au, 193Au, 194Au, 195Au, 196Au, 198Au, 199Au, 200Au, 201Au, 202Au, 203Au, 204Au, 205Au