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Question

What is Group 11 called?


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Solution

The characteristics of Group 11 are as follows:

  1. Copper (Cu), Silver (Ag), and Gold (Au), Roentgenium (Rg) are the chemical elements of Group 11 in the periodic chart, according to modern IUPAC numbering.
  2. Group 11 elements are inert and corrosion-resistant metals that are also known as coinage metals due to their use in coin minting.
  3. The valence electronic configuration of Group 11 elements are n-1d9ns1 with +1oxidation state by the loss of single ns electron.
  4. However, because of the relatively low values of the second and (for Au) third ionization energies, higher oxidation states are known: +2 is prevalent for Cu and, to a lesser extent, Ag, and +3 for Au. Due to the half-filled ns orbital in neutral atoms, all three elements have large electron affinities.
  5. These group elements have a period of 4 to 7 and a valence shell of 4 to 7.
  6. The atomic number of Copper, Silver, Gold and Roentgenium are 29, 47, 79, and 111.
  7. The atomic radii of the Group 11 elements are:

Elements

Atomic radii (pm)

Copper

128

Silver

144

Gold

144

Roentgenium

114 (predicted)


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