The metal calcium crystallises in fcc unit cell with a = 600 pm. Calculate the density of the metal if it contains `0.2%` Schottky defects.

Options

A. 2.05 g/ cc
B. 5g / cc
C. 20 g/ cc
D. 50 g/cc

Answer

A

Explanation

due to schotky defects, no of atoms decrease
`Z = 4 - 4 xx (0.2)/(100) = 3.992 , Z = (rho N_0 V)/(M)`