An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face and ‘B’ ions occupying corners of the cube. The formula of compound is

Total number of different primitive unit cells are

The volume of atoms present in body centred cubic unit cell of a metal of atomic radius r is,

The substances which can be permanently magnetised are

$Cr{O}_{2}CrO\_2$ is

A metallic element crystallises in face centred cubic structure. If the radius of metal ion is 0.92 Å, the edge length of the unit cell of the crystal is

The volume of unit cell of a metallic crystal of bcc type is $8.4\times 10^{-23}c{m}^3\mathrm{.}8.4\; \backslash times\; 10\; ^\{-23\}\; \backslash ,cm\; ^3.$ The volume occupied by 10 atoms in the crystalline structure is :

Copper crystallises in face centred cubic structure. If the unit cell length is 360 pm, the radius of copper atom is

If all the lattice points in ccp structure namely comers, face and edge centres and body centre are occupied by atoms then the total number of atoms in the unit cell will be

Gold crystallises in face centred cubic structure. If atomic mass of gold is $197gmo{l}^{-1}197\; \backslash \; g\; \backslash \; mol^\{-1\}$ , the mass of the unit cell of gold will be