Question

which are the following is correct for bcc unit cell?
1) r= 0.4330 a
2) r=0.5000 a
3) r= 0.3535
4) r= 0.5237 a​

Answer 1

Answer:

For a BCC unit cell, r = 0.433o a.

Explanation:

BCC unit Cell: It is a Body Centred Cubic unit cell. In such type of cells, one atom is present at the centre in addition to the atoms present at the 8 corners of the unit cell. Number of atoms per unit cell is 2 and its coordination number is 8. Coordination number shows the number of atoms attached to the central atom.

For a Body Centred Cubic unit cell , the radius of the lattice is equal to 0.4330 times of edge length.

So the correct option is A.