Question

The correct option for the number of body-centered unit cells in all 14 types of Bravais lattice unit cells is ______.

Options

• 3

• 7

• 5

• 2

Answer 1

The correct option for the number of body-centred unit cells in all 14 types of Bravais lattice unit cells is 3.

Explanation:

The 14 Bravais lattices describe all possible 3D lattice types.

Body-centred unit cells have lattice points at 8 corners + 1 at the centre of the cell.

Only 3 crystal systems among the 14 have a body-centred (I) lattice type:

• Cubic body-centred (bcc)
• Tetragonal body-centred
• Orthorhombic body-centred