Question

What statements correctly describe the crystal structure of halite?

The unit cell consists of eight ions: four are Na+ ions and the other four are Cl– ions.
The crystal structure is face-centered cubic (FCC).
The sodium ions occupy the lattice points.
The crystal structure is body-centred cubic (BCC).
Each ion in this lattice has six of the other kind of ion as its nearest neighbors.

Answer 1

The unit cell consists of eight ions: four are Na+ ions and the other four are Cl– ions.

This is true because NaCl is a one to one ratio and each have 4 ions

The crystal structure is face-centered cubic (FCC).

This statement is also true

The sodium ions occupy the lattice points.

This is not true. Anions occupy lattice points. So the Cl- ions occupy the lattice points.

The crystal structure is body-centred cubic (BCC).

Each ion in this lattice has six of the other kind of ion as its nearest neighbors.

Both of these statements are false