Question

Thallium (I) chloride crystallizes in either a simple cubic lattice or FCC lattice of Cl⁻ ion. The density of a given sample of solid is 9.0 g cm⁻³ and edge of the unit cell is 3.95 x 10⁻⁸ cm. Predict the category of unit cell. 

Answer 1

Given: Density = 9.0 g cm^–3 

 Edge length (a) = 3.95 x 10⁻⁸ cm 

 Atomic mass of Th (M) = 232 

To find: Category of unit cell = ? 

Formula: i. V = a³

From formula (ii), 

z =1 atom per unit 

Hence it is Simple cubic structure (SC)