  Question

The number of atoms per unit cell in a sc, bcc and fcc system are respectively :

A
1, 2 and 4  B
8, 6 and 10  C
1, 4 and 2  D
2, 4 and 1  Solution

The correct option is A 1, 2 and 4The primitive cubic system consists of one lattice point on each corner of the cube. Each atom at a lattice point is then shared equally between eight adjacent cubes, and the unit cell, therefore, contains in total one atom.The body-centred cubic system has one lattice point in the centre of the unit cell in addition to the eight corner points. It has a net total of 2 lattice points per unit cell.The face-centred cubic system has lattice points on the faces of the cube, that each gives exactly one-half contribution. In addition to the corner lattice points, giving a total of 4 lattice points per unit cell.For simple cubic, number of atoms per cell = 1For bcc, number of atoms per cell = 2For fcc, number of atoms per cell = 4Chemistry

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