Ferric oxide crystallizes in a hexagonal close - packed array of oxide ions with two of every three octahedral holes occupied by ferric ions . Derive the formula of ferric oxide .

A metal oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by metal ions. The formula of metal oxide is

In a cubic closed packed structure of mixed oxide, the oxide ions are in CCP arrangement 1/6 of tetrahedral voids are occupied by cations A and 1/2 of octahedral voids are occupied by cations B. The formula of the oxide is

Structure of a mixed oxide is cubic close-packed (ccp). The unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is

Lithium selenide can be described as a cubic closest-packed array of selenide ions with lithium ions in all of the tetrahedral holes. Formula of lithium selenide is

A spinel is an important class of oxides consising of two types of metal ions with the oxide ions arranged in cop layers. The normal spinel has one-eigth of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by Mg^(2+), A^(2+) and O^(2-) . The neutratrality of the crystal is maintained. Type of hole occupied by Al^(3+) ions is :

A spinel is an important class of oxides consising of two types of metal ions with the oxide ions arranged in cop layers. The normal spinel has one-eigth of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by Mg^(2+), A^(2+) and O^(2-) . The neutratrality of the crystal is maintained. Type of hole occupied by Mg^(2+) ions is

A spinel is an important class of oxides consising of two types of metal ions with the oxide ions arranged in cop layers. The normal spinel has one-eigth of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by Mg^(2+), A^(2+) and O^(2-) . The neutratrality of the crystal is maintained. The formula of the spinel is

In an oxide Ore half of tetrahedral voids are occupied by A^(+x) ions and half of the octahedral voids are occupied by B^(+y) y in the ‘hcp' arrangement of oxide ions. What is (x+y) ?

In a metal oxide, oxide ions are arranged in hep array and the metal ion occupies octa­hedral holes. If one third of octahedral voids and all tetrahedral voids are empty the metal oxide formula is (M- metal)