In The mineral, spinel having the formula `MgAl_2O_4`, oxide ions are arranged in the cubic close packing, `Mg^(2+)` ions occupy the tetrahedral voids while `Al^(3+)` ions occupy the octahedral voids.
What percentage of tetrahedral voids is occupied by `Mg(2+)` ions?

In The mineral, spinel having the formula MgAl_2O_4 , oxide ions are arranged in the cubic close packing, Mg^(2+) ions occupy the tetrahedral voids while Al^(3+) ions occupy the octahedral voids. What percentage of octahedral voids Is occupied by Al^(3+) ions?

In a crystalline solid, having formula AB_(2)O_(4) 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. (a) What percentage of the tetrahedral voids is occupied by A? (b) What percentage of the octahedral voids is occupied by B ?

In a crystalline solid having formula AB_(2)O_(4) , oxide ions are arranged in a cubic close-packed lattice while cations A and B are present in tetrahedral and octahedral voids respectively. What percentages of tetrahedral and octahedral voids are occupied by A and B ions respectively?

In sapphire, oxide ions are arranged in hexagonal close packing and aluminium ions occupy two-thirds of the octahedral voids. What is the formula of sapphire?

Crystal structure of the oxide AB_(2)O_(4) is bassed on the cubic close packed (ccp) array of O^(2-) ions, with A^(2+) ions occupying some tetrahedral voids and B^(3+) ions occupying some octahedral voids. If a crystal of this oxide contains 1 mol AB_(2)O_(4) formula unit, then calculate (1) total number of voids in the crystal (2) total number of tetrahedral voids occupied by A^(2+) ions (3) total number of octahedral voids occupied by B^(3+) ions.

In chromium (III) chloride CrCl_(3) chloride ions have cubic close packed arrangement and Cr (III) ions present in the octahedral voids. What fraction of the octahedral void is occupied ? What fraction of the total number of voids is occupied?

AgI crystallises in a cubic close-packed ZnS structure. What fraction of tetrahedral sites is occupied by Ag^(+) ions ?

A mineral MX_(2) crystallizes in ccp of M^(2+) ions whereas X^(-) ions occupy the tetrahedral voids. The number of cations and anions per unit cell, the coordination number of cation and percent of tetrahedral voids occupied are :

In a crystalline solid , anion B^- are arranged in a cubic close packing. Cations A^+ are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied, what is the formula of the solids?

If silver iodide crystallizes in zinc blende structure with I^- ions forming the lattice, then what fraction of tetrahedral voids is occupied by Ag^+ ions?