An element has bcc structure with a cell edge of 288 pm. The density of the element is 7.2 g cm^-3. How many atoms are present in 208 g of the element.

If NaCl is doped with 10^-2 mol percentage of strontium chloride, what is the concentration of  cation vacancy?

KF crystallizes in fcc structure like sodium chloride. Calculate the distance between K⁺ and F⁻ in KF. (given : density of KF is 248 g cm^-3)

An atom crystallizes in fcc crystal lattice and has a density of 10 gcm⁻³ with unit cell edge length of 100pm. Calculate the number of atoms present in 1 g of crystal.

Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3 x 10^-8 cm. Calculate the radius of sodium atom.