GENERAL GEOLOGY

Detailed explanation-1: -Ans-The simple cubic unit cell consists of eight atoms, which outline the cube itself. These are corner atoms, so each contributes only one-eighth of an atom to the unit cell, resulting in a total of one atom.

Detailed explanation-2: -Since an atom at a corner of a simple cubic unit cell is contained by a total of eight unit cells, only one-eighth of that atom is within a specific unit cell. And since each simple cubic unit cell has one atom at each of its eight “corners, ” there is 8×18=1 atom within one simple cubic unit cell.

Detailed explanation-3: -A cubic unit cell has one atom on each corner and one atom on each body diagonal.

Detailed explanation-4: -Therefore, the total number of atoms in a unit cell = 4 atoms.

Detailed explanation-5: -The number of atoms per unit cell of FCC crystal structure = 4 and, The number of atoms per unit cell of BCC crystal structure = 2.