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What is the co-ordination number of each...

What is the co-ordination number of each sphere in cubic close packing and hexagonal close packing ?

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To determine the coordination number of each sphere in cubic close packing (CCP) and hexagonal close packing (HCP), we can analyze the arrangement of atoms in both structures step by step. ### Step 1: Understanding Cubic Close Packing (CCP) 1. **Definition**: Cubic close packing, also known as face-centered cubic (FCC), consists of layers of atoms arranged in an ABC-ABC pattern. 2. **Layer Arrangement**: - The first layer is arranged in a hexagonal pattern. - The second layer is placed in the gaps of the first layer. - The third layer is again placed in the gaps of the second layer, and this pattern continues. ...
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