GEOLOGY

Detailed explanation-1: -A face-centered cubic unit cell has 4 atoms per unit cell.

Detailed explanation-2: -The face-centered cubic (FCC) has a coordination number of 12 and contains 4 atoms per unit cell.

Detailed explanation-3: -Ans-In a unit cell, the number of an atom’s coordinates equals the number of atoms it contacts. The nearest hexagonal pack (hcp) has six atoms per unit cell and has a coordination number of 12. The face-centered cubic (fcc) includes four atoms per unit cell and a total of 12 coordinates.

Detailed explanation-4: -Thus, face centered cubic lattice has maximum number of atoms per unit cell.

Detailed explanation-5: -A face centred cubic unit cell has atoms at all the corners and at the centre of all faces of the cube. In a cubic unit cell, each corner atom is shared between 8 unit cells. So, the total atoms of the face centered cubic cell are 4.