Question

The coordination number for a close packing in 1-D lattice is :

Answer 1

For a close packing in 1-D, two spheres are in contact with a particular sphere as shown.

So, the coordination number is 2
Packing Efficiency in 1-D Lattice:

1. Arrangement of maximum stability.
2. Arrangement of minimum potential Energy.
3. Arrangement of maximum efficiency (100%).