1.

Ionic radii of cation A+ and anion B- are 102 and 181 pm respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for B- . A+ is present in all octahedral voids. The edge length of the unit cell of the crystal AB is _____ pm. (Nearest Integer)

Answer»

Correct answer is 566

a = 2(r+ + r-

a = 2 (102 + 181) 

a = 2(283) 

a = 566 pm



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