MgO Has A Structure Of NaCl, The Coordination Number Of O2– in MgO Is

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The anions (A) from hexagonal close packing and atoms (M) occupy only two-third of the octahedral voids. The general formula of the compound is

In a crystalline solid, having formula AB₂O₄, oxide ions are arranged in cubic close packed lattice while cations A are present in tetrahedral voids and cations B are present in octahedral voids. The percentage of tetrahedral voids occupied by A is     

Ag metal crystallises in a cubic closest packed arrangement with the edge of the unit cell having a length a = 407 pm. The radius of the similar atom is 

The density of solid argon is 1.65 g/mL at –233^oC. If the argon atom is assumed to be sphere of radius 1.54 × 10^–8 cm, what percentage of solid argon is apparently empty space?(At wt of Ar = 40).

A compound CuCl has fcc structure. Its density is 3.4 g cm^–3, what is the length of unit cell?

A metal crystallizes into two cubic phases fcc and bcc whose unit cell lengths are 3.5 and 3.0 Å respectively. What is the ratio of densities of fcc and bcc?

The radius of a divalent cation M²⁺ is 94 pm and that of divalent anion X^2–is 146 pm. Thus, M²⁺ X^2– has

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

The composition of a sample of wustite is Fe_0.93 O. What percentage of the iron is present in the form of  Fe III?