The number of atoms in 100g of a face crystal with density $=10g\mathrm{/}c{m}^3=\; 10\; g/cm^3$ and cell edge equal to 200 pm is equal to

Ice crystallises in a hexagonal lattice having a volume of the unit cell as $132\times {10}^{-24}c{m}^{3}132\; \backslash times10^\{-24\}\backslash ,cm^3$. If density of ice at the given temperature is $0.92gc{m}^{-3}0.92g\backslash ,cm^\{-3\}$, then the number of $H_{2}OH\_2O$ molecules per unit cell is

The edge length of a face-centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is

Percentages of free space in cubic close-packed structure and in body-centred packed structure are respectively

Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

Number of unit cells in 4g of ‘x’ (atomic mass = 40) which crystallize in bcc pattern is : ($N_{A}N\_A$ =  Avogadro number)

In an ionic compound $A^{+}{X}^{-}A\; ^+X^-$, the radii of $A^{+}A^+$ and $X^{-}X^-$ions are 1.0 pm and 2.0 pm respectively. It shows NaCl type of crystal structure. The volume of the unit cell of the crystal of AX will be

Schottky defect in crystals is observed

The colours of alkali metal halides  due to -

Crystal with metal deficiency defect is