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Chapter 10: Q79E. (page 592)

Cobalt metal crystallizes in a hexagonal closest packed structure. What is the coordination number of a cobalt atom?

Short Answer

Expert verified

The coordination number of cobalt in hexagonal closest packing structure is 12.

Step by step solution

01

Defining the coordination number

The number of particles surrounding a single particle in the crystal lattice is known as the coordination number

02

Calculating the coordination number of cobalt

In hexagonal closest packing structure, four constituent particles are present in the layer above, four constituent particles are present in the layer below, and four constituent particles are present at the layer of the unit cell. Hence, the coordination number of aluminium in the face centred cubic structure is 12.

Therefore, the coordination number of cobalt in the hexagonal closest packing structure is 12.

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