1.10 Calculate the efficiency of packing in case of a metal crystal for
(ii) body-centred cubic
(ii) Body centred cubic:- In body centred cubic, we have atoms at all corners and at body centre.
Clearly, the atom at the centre will be in touch with the other two atoms diagonally arranged.
Also the length of body diagonal is equal to 4r.
The volume of a cube :
In BCC, the total number of atoms is 2.