For natl, is the unit cell of it based on the repetition of body centered cubic and the holes in this unit cell are octahedral?

The answer for this would be YES, it is octahedral. For NATl, the unit cell of it based on the repetition of body centered cubic and the holes in this unit cell are octahedral. Octahedral is the term that describes the shape of compounds with six atoms or groups of atoms. Hope this answer helps.

Ur e n d is not real