Which of the following statements are not true ?

Options

A. An element with BCC structure has two atoms per unit cell.
B. An ionic compound ` A^(+) B^(-)` with BCC structure has one AB formula unit per unit cell.
C. The shape of the octahedral void is octahedral.
D. The edge of the crystal `A^(+) B^(-)` is equal to the distance between ` A^(+) and B^(-)` ions.

Explanation

Octahedral void is so called because it is surrounded by six atoms. Edge length of ` A^(+)B^(-)` crystal= 2` xx ` distance between ` A^(+) and B^(-)`