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  4. The coordination number of metal crystallising in a hexagonal close packing is

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Q. The coordination number of metal crystallising in a hexagonal close packing is

IIT JEEIIT JEE 1999The Solid State

Solution:

Three consecutive layers of atoms in hexagonal close packed lattice is shown below:
image
Atom $X$ is in contact of $12$ like atoms, $6$ from layer $B$ and $3$ from top and bottom layers $A$ each.