Which of the following statements are correct?  

Options

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

Answer

A, C, D

Explanation

CsCl = BCC - C.N =8
`NaCl, a=2r_( c) + 2r_(a) , 552 =2(95) + 2(181)`, lonic crystal share its unit with cell with other unit cells.