# 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.

;  and

Also the length of body diagonal is equal to 4r.

Thus,

The volume of a cube :

In BCC, the total number of atoms is 2.

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