79 196.970
Au
Gold

Gold , 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 jewellery.

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 colour 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.

 

  • Listed below are a selection of some more commonly used sizes. If you do not see anything that suits your needs, please click on the custom request forms and send us your requirements.
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G4-5002-M
Au Pellets 6mm dia. x 6mm long 99.99% PureGold
G4-5003-M
Au-Ge Pieces 88-12 wt% 3-6mm 99.99% PureGold-Germanium
G4-5005-M
Au Pellets 1-3mm 99.99% PureGold
G4-5007-M
Au Pellets 6.35mm dia. x 6.35mm long 99.999% PureGold
G4-5013-M
Au Pellets 3.18mm dia. x 3.18mm 99.99% PureGold
G4-5021-M
Au-Ge Small flakes 88-12wt% 99.99% PureGold-Germanium
G4-10003-P
AuCl3 -8 Mesh 99% PureGold Chloride
G4-10004-P
Au2O3 -100 Mesh 99.9% PureGold Oxide
AU-RD-1.58

Au Rod Diameter 1.588mm (0.0625")

Gold

AU-RD-12.7

Au Rod Diameter 12.7mm (0.500")

Gold

AU-RD-15.88

Au Rod Diameter 15.88mm (0.625")

Gold

AU-RD-19.05

Au Rod Diameter 19.05mm (0.750")

Gold

AU-RD-25.4

Au Rod Diameter 25.4mm (1.0")

Gold

AU-RD-3.175

Au Rod Diameter 3.175mm (0.125")

Gold

AU-RD-6.35

Au Rod Diameter 6.35mm (0.250")

Gold

AU-SHT-0.25

Au Sheet Thickness 0.25mm (0.010")

Gold

AU-SHT-0.38

Au Sheet Thickness 0.38mm (0.015")

Gold

AU-SHT-0.50

Au Sheet Thickness 0.50mm (0.020")

Gold

AU-SHT-0.76

Au Sheet Thickness 0.762mm (0.030")

Gold

AU-SHT-1.0

Au Sheet Thickness 1.0mm (0.040")

Gold

AU-SHT-1.5

Au Sheet Thickness 1.54mm (0.060")

Gold

AU-SHT-3.175

Au Sheet Thickness 3.175mm (0.125")

Gold

AU-SHT-6.35

Au Sheet Thickness 6.35mm (0.250")

Gold

G4-1005-W
Au Wire 0.1mm dia. 99.99% PureGold
G4-1007-W
Au Wire 0.2mm dia. 99.99% PureGold
G4-1011-W
Au Wire 0.5mm dia. 99.99% PureGold
$401.28/MTR
51 MTR in stock
Select Qty
G4-1013-W

Au Wire 1.0mm dia. 99.99% Pure

Gold

G4-1015-W

Au Wire 1.5mm dia. 99.99% Pure

Gold

G4-1017-W
Au Wire 2.0mm dia 99.99% PureGold
G4-1018-W
Au Wire 0.3mm dia. 99.99% PureGold
G4-9000-D
Gold Au, Availabel purities 99.99% & 99.999%
G4-9001-D
Gold-Palladium Au-Pd, Available in various ratios wt% or at%, Purity 99.95% & 99.99%
G4-9002-D
Gold-Silicon Au-Si, Available in various ratios wt% or at%, Purity 99.99%
G4-9011-D
Gold-Platinum Au-Pt, Available in various ratios wt% or at%, Purity 99.99%
G4-9013-D
Gold-Silver Au-Ag, Available in various ratios wt% or at%, Purity 99.99%
AU-F-0.1

Au Foil Thickness 0.1mm (0.004") Purity 99.99%

Gold

AU-F-0.15

Au Foil Thickness 0.15mm (0.006") Purity 99.99%

Gold

AU-F-0.2

Au Foil Thickness 0.2mm (0.008") Purity 99.99%

Gold

G4-3003-F

Au Foil Thickness 0.1mm (.004")

Gold

G4-3005-F

Au Foil Thickness 0.152mm (.006")

Gold

G4-3007-F

Au Foil Thickness 0.2mm (.008")

Gold

G4-9000-D1
Au TRG 60mm dia. x 0.1mm Tk 99.99% PureGold
G4-9000-D10
Au TRG 57mm dia. x 0.3mm Tk 99.99% PureGold
G4-9000-D12
Au TRG 57mm dia. x 0.2mm Tk 99.99% PureGold
G4-9000-D16
Au TRG 57mm dia. x 0.5mm Tk 99.99%Gold
G4-9000-D26
Au TRG 57mm dia. x 0.4mm Tk 99.99% PureGold
G4-9000-D27
Au TRG 54mm dia. x 0.1mm Tk 99.99% PureGold
G4-9000-D5
Au TRG 73mm dia. x 0.1mm Tk 99.99% PureGold
G4-9000-D7
Au TRG 57mm dia. x 0.1mm Tk 99.99% PureGold
$673.20/PCS
14 PCS in stock
Select Qty
G4-9001-D1
Au-Pd 80-20wt% TRG 57mm dia. x 0.1mm TkGold-Palladium
G4-9001-D14
Au-Pd 80-20 wt% TRG 76.2mm dia. x 0.2mm Tk99.99% PureGold-Palladium
G4-9001-D16
Au-Pd 60-40 wt TRG 60mm dia. x 0.2mm Tk99.99% PureGold-Palladium
G4-9001-D4
Au Pd 60-40 wt% TRG 12.5mm dia. x 0.2mm Tk 99.99%PureGold-Palladium
G4-9001-D7
Au-Pd 60-40wt% TRG 60mm dia. x 0.1mmGold-Palladium, Purity 99.99%
G4-9001-D9
Au-Pd 80-20wt% TRG 57mm dia. x 0.2mm 99.99% PureGold-Palladium
G4-9000-D22
Au TRG 50.8mm dia. x 2mm Tk 99.99% PureGold
G4-9000-D50
Au TRG 50.8mm dia. x 3mm Tk 99.99% PureGold
G4-9000-D56
Au TRG 50.8mm dia. x 1mm Tk 99.99% PureGold

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.

Symbol Au
Atomic Number 79
No. of naturally occurring isotopes 1
Atomic weight 196.9665
Electronic configuration [Xe]4f145d106s4
Metal radius (12coordinate)/pm 144
Effective ionic radius)6-coord)/pm V 57
Effective ionic radius(6-coord)/pm III 85
Effective ionic radius(6-coord)/pm II -
Effective ionic radius(6-coord)/pm I 137
Electronegativity χ 2.4
Density (20°C)/gcm-3 19.32
Melting point /°C 1064
Boiling point /°C 2808
ΔHvap/kJmol-1 12.8
ΔHfus/kJmol-1 343(+/-U)
ΔHf(monoatomic gas)/kJmol-1 379(+/-8)
Ionization energy/kJmol-1 I 889.9
Ionization energy/kJmol-1 II 1973.3
Ionization energy/kJmol-1 III -2895
Electrical resistivity
(20°C)/μohm cm 2.35
Temperature (oC) @Vap. Pressure
10-8 Torr 807
10-6 Torr 947
10-4 Torr 1132
Techniques
Electron Beam Excellent
Crucible Al2O3, BN & Vitreous Graphite
Coil Tungsten
Boat Tungsten, Molybdenum coated Al2O3
Remarks
Films soft. Not very adherent.