Question

$Zn$ converts its molten state to its solid state. If it has an hcp structure, then find out the number of nearest atoms.

• A. $6$
• B. $8$
• C. $12$
• D. $4$

Answer 1

The correct option is C $12$

In the hcp structure, the coordination number is $12$. Since $Zn$ is in hcp structure, the number of nearest neighbours is $12$, six are in the plane, $3$ above the plane, and $3$ below the plane.