Final answer:
A simple cubic (SC) structure has 1 atom per cell and a coordination number of 6.
Step-by-step explanation:
In a simple cubic (SC) structure, there is 1 atom per cell and a coordination number of 6.
The coordination number refers to the number of atoms surrounding a central atom in a crystal lattice structure. In the case of a simple cubic structure, each atom contacts six other atoms.
This arrangement is relatively inefficient and has a low packing density of about 52%.