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Question:

(i) What is meant by the term 'coordination number'?

(ii) What is the coordination number of atoms:

(a) in a cubic close-packed structure?

(b) in a body-centred cubic structure?

Answer:

(i) It is defined as the number of nearest neighbours of particle in a close packed structure.

(ii) a) In a cubic close packed structure the coordination number is 12.

b) In a body centered cubic close structure the coordination number is 8.


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