Question

Explain why the hexagonal close packing is more efficient than square close packing when considered in a plane?

Answer 1

Hexagonal close packing (hcp) is more efficient than square close packing because

1. Higher Coordination Number: In hcp, each particle is surrounded by 6 other particles, while in square packing, each particle is surrounded by only 4 particles. This higher coordination number means better space utilization.
2. Higher Packing Efficiency: Hcp has a packing efficiency of approximately 74%, compared to 52.4% for square close packing. This means that hcp leaves less empty space between particles.
3. Closer Particle Arrangement: In hcp, particles are arranged more closely and symmetrically, providing greater structural stability.