Question

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

• A. $12$
• B. $4$
• C. $8$
• D. $6$

Answer 1

Answer: (A)

$12$

Answer 2

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