Question

19. A solid AB has NaCl structure. if radius of the
cation A'is 120 pm, what is the maximum value
of the radius of the anion ?
(a) 290 pm
(b) 310 pm
(e) 534 pm
(d) 164 pm
​

Answer 1

Radius ratio = r+r−r+r− = 0.414

OR 100rB−100rB− = O.414

SO rB−=1000.414rB−=1000.414

= 241 pm