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Gold (Au)

From Wikipedia, the free encyclopediaGold is a chemical element with symbol Au (from Latin:aurum) and atomic number 79. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable and ductile metal. Chemically, gold is a transition metal and a group 11 element.

Gold in the periodic table

SymbolAu
Atomic number79
Group11
Period6
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density19.3 g/cm3
Atomic weight196.967 u
Melting point1337.33 K
1064.18 °C
1947.524 °F
Boiling point3243 K
2969.85 °C
5377.73 °F

Atomic properties

Electronegativity (Pauling Scale)2.54
Electron affinity222.747 kJ/mol
Oxidation states−3, −2, −1, 0, +1, +2, +3, +5
(an amphoteric oxide)
Ionization energies
1890.1 kJ/mol
2 1980 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Xe] 4f14 5d10 6s1
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1
Electrons per shell2, 8, 18, 32, 18, 1

History

Discovered-6000
Discovered byLevant
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