The intermetallic compounds `LiAg` crystallises in cubic lattice in which both lithium and silver have coordination number of eight ,the crystal class is

Options

A. Simple cube
B. Body-centred cube
C. Face-centred cube
D. None of these

Answer

B

Explanation

If lithium and silver crystallizes as body–centred cubic lattice as shown in the figure, then each corner atom is shared by 8 unit cells so each Li atom can touch 8 Ag atoms (which are at the centres of those 8 unit cells). So co–ordination no. of Li = 8 . Each body centred Ag atom is at the contact with 8 Li atoms. Thus co-ordination number of Ag = 8.