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 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 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 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?

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?

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 :

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

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?