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Chemical element, symbol Ag and atomic number 47 / From Wikipedia, the free encyclopedia

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Silver is a chemical element with the symbol Ag (from Latin argentum 'silver', derived from the Proto-Indo-European h₂erǵ 'shiny, white') and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.[6] The metal is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.

Quick facts: Silver, Appearance, Standard atomic weight .m...
Silver, 47Ag
Appearancelustrous white metal
Standard atomic weight Ar°(Ag)
  • 107.8682±0.0002
  • 107.87±0.01 (abridged)[1]
Silver in the periodic table


Atomic number (Z)47
Groupgroup 11
Periodperiod 5
Block  d-block
Electron configuration[Kr] 4d10 5s1
Electrons per shell2, 8, 18, 18, 1
Physical properties
Phase at STPsolid
Melting point1234.93 K (961.78 °C, 1763.2 °F)
Boiling point2435 K (2162 °C, 3924 °F)
Density (near r.t.)10.49 g/cm3
when liquid (at m.p.)9.320 g/cm3
Heat of fusion11.28 kJ/mol
Heat of vaporisation254 kJ/mol
Molar heat capacity25.350 J/(mol·K)
Vapour pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1283 1413 1575 1782 2055 2433
Atomic properties
Oxidation states−2, −1, 0,[2] +1, +2, +3 (an amphoteric oxide)
ElectronegativityPauling scale: 1.93
Ionisation energies
  • 1st: 731.0 kJ/mol
  • 2nd: 2070 kJ/mol
  • 3rd: 3361 kJ/mol
Atomic radiusempirical: 144 pm
Covalent radius145±5 pm
Van der Waals radius172 pm
Color lines in a spectral range
Spectral lines of silver
Other properties
Natural occurrenceprimordial
Crystal structure face-centred cubic (fcc)
Face-centered cubic crystal structure for silver
Speed of sound thin rod2680 m/s (at r.t.)
Thermal expansion18.9 µm/(m⋅K) (at 25 °C)
Thermal conductivity429 W/(m⋅K)
Thermal diffusivity174 mm2/s (at 300 K)
Electrical resistivity15.87 nΩ⋅m (at 20 °C)
Magnetic orderingdiamagnetic[3]
Molar magnetic susceptibility−19.5×10−6 cm3/mol (296 K)[4]
Young's modulus83 GPa
Shear modulus30 GPa
Bulk modulus100 GPa
Poisson ratio0.37
Mohs hardness2.5
Vickers hardness251 MPa
Brinell hardness206–250 MPa
CAS Number7440-22-4
Discoverybefore 5000 BC
Symbol"Ag": from Latin argentum
Isotopes of silver
Main isotopes[5] Decay
abun­dance half-life (t1/2) mode pro­duct
105Ag synth 41.3 d ε 105Pd
106mAg synth 8.28 d ε 106Pd
107Ag 51.8% stable
108mAg synth 439 y ε 108Pd
IT 108Ag
109Ag 48.2% stable
110m2Ag synth 249.86 d β 110Cd
111Ag synth 7.43 d β 111Cd
Symbol_category_class.svg Category: Silver
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Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold:[7] while it is more abundant than gold, it is much less abundant as a native metal.[8] Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of the seven metals of antiquity, silver has had an enduring role in most human cultures.

Other than in currency and as an investment medium (coins and bullion), silver is used in solar panels, water filtration, jewellery, ornaments, high-value tableware and utensils (hence the term "silverware"), in electrical contacts and conductors, in specialized mirrors, window coatings, in catalysis of chemical reactions, as a colorant in stained glass, and in specialized confectionery. Its compounds are used in photographic and X-ray film. Dilute solutions of silver nitrate and other silver compounds are used as disinfectants and microbiocides (oligodynamic effect), added to bandages, wound-dressings, catheters, and other medical instruments.