Q. How many six-fold axis of symmetry does a hexagonal close packing have?
The Solid State
Solution:
A six-fold axis is that axis around which when a crystal is rotated by $60^{\circ}$, we get the same arrangement.
Hence the imaginary line joining the end centres of a hexagonal close packing is called the six-fold axis of symmetry. A hcp can have only one six-fold axis of symmetry.
