Question

Define unit cell of a crystalline solid. Find the number of atoms present in one unit cell of an f.c.c. atomic crystal.​

Answer 1

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crystalline solid can be represented by its unit cell, which is the smallest identical unit that when stacked together produces the characteristic three-dimensional structure. ... The simple cubic unit cell contains only eight atoms, molecules, or ions at the corners of a cube.

The face-centred cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The atoms in the corner are shared by 8 unit cells and thus contributes to 1/8 of itself to the crystal lattice.

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Answer 2

Answer:

The smallest repeating unit of a crystal lattice is the unit cell. The simple cubic unit cell contains only eight atoms, molecules, or ions at the corners of a cube . A face-centered cubic (fcc) unit cell contains a component in the center of each face in addition to those at the corners of the cube.