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 the cation ? Can a cation C^+ having a radius of 180 pm be slipped into the tetrahedral site of the crystal A^+ B^- ? Give reason for your answer.

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

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 the cation ? Can a cation C^+ having a radius of 180 pm be slipped into the tetrahedral site of the crystal A^+ B^- ? Give reason for your answer.
Answer» Solution :`(r_(+)(C^+))/(r_(-)(B^-))="180pm"/"250pm"=0.72` It does not lie in the RANGE 0.225-0.414 . HENCE, `C^+` cannot be slipped into the tetrahedralsite.