Question

In hcp arrangement, the coordination number is:

• A. $6$
• B. $12$
• C. $8$
• D. $10$

Answer 1

The correct option is B $12$

The figure shows the arrangement of atoms in hcp arrangement. From the figure, it is clear that the coordination number of an atom $=12$.

The coordination number of an atom is defined as the number of atoms touching that particular atom in a unit cell.