GEOLOGY

Detailed explanation-1: -A cubic unit cell has six faces. Therefore, in a cubic lattice irrespective of its nature, a cubic unit cell is shared equally by 6 unit cells.

Detailed explanation-2: -The atom in the face is shared with the adjacent cell. No matter what the crystal lattice be, each unit cell is always connected to six other unit cells and thereby each face of the unit cell is connected to any one face of another unit cell. Hence, all atoms at face are shared equally by two adjacent unit cells.

Detailed explanation-3: -In a face-centered cubic lattice, a unit cell is shared equally by 6 unit cells.

Detailed explanation-4: -The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell.