What is the coordination number of hexagonal close packing (hcp) lattice?

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Solution

The correct option is A 12
Coordination Number in hcp :
In hcp lattice
Each sphere touches 6 spheres in its layer +3 spheres below the layer+3 spheres,above the layer

$Examples : M g, C d, Z n, T i a n d B e$

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Z_{e f f} = Total number of atoms in hcp lattice O_{v} = Total number of octahedral voids T_{v} = Total number of tetrahedral voids

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