Question

Which of the following statements are correct ?
A. The coordination number of each type of ion in CsCl crystal is 8
B. A metal that crystallizes in bcc structure has 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 edge of unit cell of NaCl is 552 pm (`r_(Na^+)` =95 pm, `r_(Cl^-)`=181 pm)

Answer 1

Correct Answer - A,C,D
(d) is correct because length of unit cell `=2(r_(Na^+)+r_(Cl^-))`=2(95+181) pm
(a) and (c ) are also corect
Only (b) is wrong because for a metal with bcc structure, coordination number =8