The unit cell of aluminum is a cube with an edge length of 405 pm. The density of aluminum is 2.70 g cm-3. The type of unit cell is


Correct option is

Face centred cubic


we know that,




     = 3.9 = 4

Face centred cubic unit cell contains 4 atom per unit cell, therefore, the given unit cell is face centred cubic unit cell.



MgO has a structure of NaCl, the coordination number of O2– in MgO is


If NaCl is doped with 10–3 mol% of SrCl2, calculate the concentration of cation vacancies


The composition of a sample of wustite is Fe0.93 O. What percentage of the iron is present in the form of  Fe III?


The first order reflection of a beam of  X – rays of wavelength  from the (210) plane of a crystal of the simple cubic type, occurs at an angle of 11.290, the length of the unit cell is


A solid AB has the NaCI structure. If radius of cation A+ is 120 pm, the maximum possible value of the radius of the anion B- is


CsCl crystallizes in a cubic lattice that has a Cl- at each corner and Cs+ at the centre of the unit cell. What is the value of edge length a of the cube?  



KCI crystallises in the same type of lattice as does NaCI.


The ratio of the side of the unit cell for NaCI to that for KCI is


A binary solid X+ Y- has a zinc blende structure with Y- ions forming the lattice and X+ ion occupying 25% tetrahedral sites. The formula of the solid is


Gold (at wt. 197g mol-1) crystallises is a cubic closest packed structures (the face – centred cubic) and has a density of 19.3g/cm2. Its atomic radius is


Calcium metal crystallizes in fcc lattice with edge length 556 pm. Calculate the density (in g cm-3) of metal if it contains 0.2% Schottky defects.