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Question

What is the coordination number of copper in Cu(NH3)42+.


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Solution

Coordination number:

  • The number of (ligand) donor atoms which are directly bonded to the central metal by a coordination bond in a coordination complex is known as the coordination number.
  • The atoms, ions, or molecules that are bonded to the central atom are called ligands.

Cu(NH3)42+:

  • Copper is the central metal to which 4 molecules of ammine are bonded by a coordination bond.
  • Thus, the coordination number of copper in the above coordination complex is 4

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