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What do you mean by coordination number ...

What do you mean by coordination number of a constituent particle in a crystal lattice? What are the coordination numbers in each of the close-packing of spheres: (a) square close-packing (b) hexagonal close-packing in two dimensions?

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(i) Coordination number of square close-packing = 4.
(ii) Coordination number of hexagonal close-packing = 6.
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