What is the radius of ratio `(r^+/r^-)` for an ion to occupy:
octahedral void.

What is the radius of ratio (r^+/r^-) for an ion to occupy: tetrahedral void.

What is the co-ordination number of an atom or ion occupying a Tetrahedral hole ?

In closest packing of A type of atoms (radius r_(A) ) the radius of atom B that can be fitted into octabedral voids is

In the closed packing of atoms A ("radius":r_(a)) , the radius of atom B that can be fitted into tetrahedral void is:

The mineral spinel has the moleculr formula Mg Al_2O_4 . In this oxide ions are present in ccp arrangement, Mg^(2+) ions occupy the tetrahedral voids while Al^(3+) ions occupy the octahedral voids. Calculate the percentage of octahedral voids occupied by Al^(3+) ions.

The mineral spinel has the moleculr formula Mg Al_2O_4 . In this oxide ions are present in ccp arrangement, Mg^(2+) ions occupy the tetrahedral voids while Al^(3+) ions occupy the octahedral voids. Calculate the percentage of tetrahedral voids occupied by Mg^(2+) ions.

In a solid, oxide ions are arrnged in ccp, cations A occupy A occupy (1/8)^th of the tetrahedral voids and cation B occupy (1/4)^(th) of the octahedral voids. The formula of the compound is:

Br^- ions from a close packed structure. If the radius of Br^- ion is 195 pm, calculate the radius of the cation that just fits into the tetrahedral hole. Can a cation having a radius of 82 pm be slipped into the octahedral hole of the crystal A^+Br^- ?