Atomic radius of silver is 144.5 pm. The unit cell of silver is a face centred cube. Calculate the density of silver.
(1) 10.50 g/cm3
(2) 16.50 g/cm3
(3) 12.30 g/cm3
(4) 15.50 g/cm3
(1) For (fcc) unit cell, atoms touch each other along the face diagonal.
Hence, Atomic radius (R)
Density (D) V = a3
D = ; where Z for (fcc) unit cell = 4 , Avagadro’s number , Volume of cube (V) and M (Mol. wt.) of silver = 108,