Which of the following statements is/are correct?

Options

A. The coordination number of each type of ion in `CsCl` crystal is `8`.
B. A metal that crystallizes in bcc structure has a coordination number of `12`.
C. A unit cell of an ionic crystal shares some of its ions with other unit cells.
D. The length of the unit cell in `NaCl` is `552` pm (`r_(Na^(o+)) = 95` pm,` r_(Cl^(o+)) = 181 pm`).

Answer

A, C, D

Explanation

`CsCl` has body-centred cubic unit cell.
Each ion in this structure has a coordinaltion number of `8`.
In `NaCl` structure (rock slat structure), chloride ions are arranged in fcc manner, wheres sodium ions occupy edge centres as well as body centres. The ions present on corners, edges, face centres are shared by adajacent unit cells.