Question

The Coordination number of ccp is ____?

Answer 1

Coordination number:

• A coordination number can be defined as the number of neighbouring atoms or ions that closely surrounding a central atom or ion in a complex or crystal.

The Coordination number of ccp:

• In Cubic Closed Packing, the spheres of the third layer do not tend to be aligned with those of either the first or the second layer.
• Thus if the first layer will be considered as ‘A’ and the second layer as ‘B’s, then the third layer as ‘C’, to the specific pattern of layers for CCP crystal lattice can be written as ABCABC,
• The close packing structure of CCP lattice can be shown as:

• Thus, considering each layer, the coordination number of Cubic Closed Packing is 12.

Hence, the coordination number of Cubic Closed Packing (CCP) is 12.