Silver

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Silver
Chemical formula Ag
Atomic Number 47 
OTP appearance silver solid 
Molar Mass(g/mol) 107.9 
Melting Point(°C) 961.8 
Boiling Point(°C) 2162 
Density(g/cc) 10.49 
Coefficient of Thermal Expansion(×10-6 °C-1) 19.7
NFPA 704
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Silver is one of the seven metals of antiquity. Along with gold and platinum it is considered one of the noble metals.

Uses

Justification Questioned

Other

  • as an excellent conductor
  • as a catalyst for the decomposition of hydrogen peroxide
  • in an amalgam composed of 40-70% silver, 0-30% tin, 2-40% copper and 0-2% zinc mixed with an equal mass of mercury, is used for dental fillings
  • -oxide and -peroxide are used for high charge density voltaic cells

Natural Occurrence

  • Elemental silver does occur naturally
  • Elemental silver occurs as an impurity in gold
  • Silver occurs as a substitution impurity in lead ores such as galena
  • Silver occurs as a substitution impurity in copper ores such as chalcopyrite

Hazards

Production

Extraction

From silver compounds

Simple heating. (2 Ag2O 2 Ag + O2 @ 280°C)

From lead bodies

See Parkes process and Cupellation.

See Also

References