Elements Group 11, Copper family, coinage metals
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Group 11, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au). Roentgenium (Rg) is also placed in this group in the periodic table, although no chemical experiments have yet been carried out to confirm that it behaves like the heavier homologue to gold. Group 11 is also known as the coinage metals, due to their former usage. They were most likely the first three elements discovered. Copper, silver, and gold all occur naturally in elemental form.

All the elements of the group except roentgenium have been known since prehistoric times, as all of them occur in metallic form in nature and no extraction metallurgy is necessary to produce them.

Like other groups, the members of this family show patterns in electron configuration, especially in the outermost shells, resulting in trends in chemical behavior, although roentgenium is probably an exception:

These elements have low electrical resistivity so they are used for wiring. Copper is the cheapest and most widely used. Bond wires for integrated circuits are usually gold. Silver and silver-plated copper wiring are found in some special applications.


G 11
29
Cu
47
Ag
79
Au
111
Rg
  
Copper Cu
  soft, malleable, ductile reddish metal
  atomic numb 29
  atomic mass 63.546
  electron shell 2,8,18,1
  melt point 1084.62°C
  boil point 2562°C
  density 8.96 g/cm³
    liquid 8.02 g/cm³
  Heat of fusion: 13.26 kJ/mol
  Heat of vaporization: 300.4 kJ/mol
  heat capacity: 24.440 J/(mol·K)
  Stable isotopes 63,65

Silver Ag
  White precious metal
  atomic numb 47
  atomic mass 107.87
  electron shell 2,8,18,18,1
  melt point 961.78°C
  boil point 2162°C
  density 10.49 g/cm³
    liquid 9.320 g/cm³
  Heat of fusion: 11.28 kJ/mol
  Heat of vaporization: 254 kJ/mol
  heat capacity: 25.35 J/(mol·K)
  Stable isotopes 107,109

  
Gold Au
  Yellow, dense precious metal
  atomic numb 79
  atomic mass 197.0
  electron shell 2,8,18,32,18,1
  melt point 1064.18°C
  boil point 2970°C
  density 19.30 g/cm³
    liquid 17.31 g/cm³
  Heat of fusion: 12.55 kJ/mol
  Heat of vaporization: 342 kJ/mol
  heat capacity: 25.418 J/(mol·K)
  Stable isotopes 197

Roentgenium Rg 111 2,8,18,32,32,17,2

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