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Question
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)
Options
300
566
499
200
MCQ
Fill in the Blanks
Solution
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 566 pm.
Explanation:
a = 2(r+ + r-)
a = 2(102 + 181)
a = 566 pm
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Close Packed Structures of Solids
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