A solid A^(+)B^(-) has NaCl type close packed structure. If the anion has a radius of 250 pm,what should be the ideal radius of cation ? Can a cationC^(+)having a radius of 180 pm be slipped into the tetrahedral site of the crtstalA^(+) B^(-)?Given reason for your answer .

A solid A^(+)B^(-) has NaCl type close packed structure. If the anion

1.	A solid A^(+)B^(-) has NaCl type close packed structure. If the anion has a radius of 250 pm,what should be the ideal radius of cation ? Can a cationC^(+)having a radius of 180 pm be slipped into the tetrahedral site of the crtstalA^(+) B^(-)?Given reason for your answer .
Answer» SOLUTION :`(r_(+)(C^(+)))/(r_(-)(B^(-))) = (180"pm")/(250"pm") = 0.72` It does not ,lie in the RANGE ( 0.225 - 0.414 . Hence`C^(+)`cannot be slipped into the tetrahedral site.