GEOLOGY

Detailed explanation-1: -Assertion :Face centered cubic cell has 4 atoms per unit cell . Reason: In fcc unit cell, there are 8 atoms at the corners and 6 atoms at face centers.

Detailed explanation-2: -Face Centered Cubic This unit cell uses 14 atoms, eight of which are corner atoms (forming the cube) with the other six in the center of each of the faces.

Detailed explanation-3: -Number of Atoms in BCC Cell Therefore, the total number of atoms in a unit cell = 4 atoms.

Detailed explanation-4: -This arrangement is called a face-centered cubic (FCC) solid. A FCC unit cell contains four atoms: one-eighth of an atom at each of the eight corners (8×18=1 atom from the corners) and one-half of an atom on each of the six faces (6×12=3 atoms from the faces).

Detailed explanation-5: -From the above table, it is clear that body-centered cubic and face-centered cubic (FCC) crystal has 2 and 4 number of atoms per unit cell.