In a cubic closed packed structure of mixed oxides the lattice is made up of oxide ions, one eighth of tetrahedral voids are occupied by divalent ions `(A^(2+))` while one half of the octahedral voids occupied trivalent ions `(B^(3+))`. What is the formula of the oxide ?

Explanation

To determine the formula of the mixed oxide based on the given information, we can follow these steps:

### Step 1: Understand the structure
In a cubic closed packed (CCP) structure, the lattice is made up of oxide ions (O²⁻). The structure is similar to face-centered cubic (FCC) where the oxide ions occupy the lattice points.

### Step 2: Calculate the number of oxide ions
In a CCP structure, there are 4 oxide ions per unit cell. This is because:
- There are 8 corner atoms, each contributing 1/8 to the unit cell.
...