Octahedral void is created by ____ lattice points.

In a cubic close-packed structure of a mixed oxide one-eighth of tetrahedral voids are occupied by divalent ions X^(2+) while one half of the octahedral voids are occupied by trivalent ions Y^(3+) . What is the formula of the compound?

If the radius of the octahedral void is r and radius of the atoms in close packing is R, derive a relation between r and R. Draw a diagram showing octahedral void and derive the relation between r and R.

Give significance of a 'lattice point'.

What is called crystal lattice ?

Fill in the blanks : The number of octahedral voids in a unit cell of a simple cube is ………..

The number of octahedral voids in a unit cell of a cubic close packed structure is

The number of tetrahedral voids in the unit cell of a face centred cubic lattice of similar atoms is

A compound alloy of gold and Cu crystallises in a cubic lattice in which the gold atoms occupy the lattice points at the comers of a cube and the copper atoms occupy the centres of each of the cube faces. What is the empirical formula of this compound ?