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Au

Gold is a chemical element with the symbol Au (from the Latin aurum, meaning shining dawn) and atomic number 79. It is a highly sought-after precious metal which, for many centuries, has been used as money, a store of value and in jewelry. The metal occurs as nuggets or grains in rocks, underground "veins" and in alluvial deposits. It is one of the coinage metals. Gold is dense, soft, shiny and the most malleable and ductile of the known metals. Pure gold has a bright yellow color traditionally considered attractive.

Gold formed the basis for the gold standard used before the fiat currency monetary system was employed by the International Monetary Fund (IMF) and the Bank for International Settlements (BIS). It is specifically against IMF regulations to base any currency against gold for all IMF member states. The ISO currency code of gold bullion is XAU.

Modern industrial uses include dentistry and electronics, where gold has traditionally found use because of its good resistance to oxidative corrosion.

Chemically, gold is a trivalent and univalent transition metal。 Gold does not react with most chemicals, but is attacked by chlorine, fluorine, aqua regia and cyanide。 Gold dissolves in mercury, forming amalgam alloys, but does not react with it。 Gold is insoluble in nitric acid, which will dissolve silver and base metals, and this is the basis of the gold refining technique known as "inquartation and parting"。 Nitric acid has long been used to confirm the presence of gold in items, and this is the origin of the colloquial term "acid test," referring to a gold standard test for genuine value。

TECHNICAL DATA
SymbolAuDensity (20°C)/gcm-319.32
Atomic number79Melting point /°C1064
No. of naturally occurring isotopes1Boiling point /°C2808
Atomic weight196.9665ΔHvap/kJmol-112.8
Electronic configuration[Xe]4f145d106s4ΔHfus/kJmol-1343(+/-U
Metal radius (12coordinate)/pm144ΔHf(monoatomic gas)/kJmol-1379(+/-8)
Effective ionic radius)6-coord)/pm V57Ionization energy/kJmol-1 I889.9
Effective ionic radius(6-coord)/pm III85Ionization energy/kJmol-1 II1973.3
Effective ionic radius(6-coord)/pm II-Ionization energy/kJmol-1 III-2895
Effective ionic radius(6-coord)/pm I137Electrical resistivity
Electronegativity χ2.4(20°C)/μohm cm2.35
EVAPORATION TECHNIQUES
Temperature (oC) @Vap. PressureTechniquesRemarks
10-8Torr10-6Torr10-4TorrElectron BeamCrucibleCoilBoat
8079471132ExcellentAl2O3, BN & Vitreous GraphiteTungstenTungsten, Molybdenum coated Al2O3Films soft. Not very adherent.



Au
Sputtering Targets
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.K           g/cc
Gold_AuAu7932019.3
Evaporation Materials
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.Kg/cc
Au ( pellets & pieces )Au7932019.3



Below is the periodic table of chemical elements。The elements in red are the ones Nexteck's product contain。 Click them, you will come to the details。

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