Body centred cubic contains 2 atoms per unit cell.

The coordination number of body centred cube lattice is 8.

Graphite shows electrical conductivity.

This is a correct answer as CaF₂ has AB₂ type structure.

The coordination number of magnesium in MgO is 6.

x/2 cm is the distance between K⁺ and F^- ions, if the cell edge is 'x' cm.

Most crystals show good cleavage because their atoms, ions or molecules are arranged in planes.

Doping of silicon ( Si ) with boron ( B ) leads to p - type semiconductor.

AB is the formula of the compound that has atoms ‘A’ are at the corners of the cube and atoms ‘B’ are at the centre of the body.

Non-stoichiometric compounds are those materials in which some small percentage of atoms are missing, or too many atoms are packed into an otherwise perfect lattice work.

Frenkel defect is caused due to the shift of a positive ion from its normal lattice site to an interstitial site.

BCC and FCC have 2 and 4 atoms per unit cell, respectively.

In a laboratory, sodium chloride is made by burning sodium in the atmosphere of chlorine, which is yellow in colour. The cause of yellow colour is the presence of electrons in the crystal lattice.

The density of ionic solids does not change due to the Frenkel defect. Hence, this is the correct answer.

Total volume of atoms present in a face-centred cubic cell of a metal is 16/3 πr³.