X+Y- crystallizes in a bcc lattice in which the radius of X+ is 0.4 Å. If all the X+ ions are removed and another cation Z+ is inserted, what should be the maximum radius of the cation Z+ to crystallize in a fcc lattice with Y?
Correct answer: D. 0.226 Å
- A. 0.548 Å
- B. 0.010 Å
- C. 0.400 Å
- D. 0.226 Å
Explanation
Following is the solution of this question:
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About Shape of Ionic Crystals
Ionic crystal shape depends on the regular arrangement of oppositely charged ions in a three-dimensional lattice. The topic covers coordination number, radius ratios, lattice geometry and structures such as sodium chloride, caesium chloride and zinc sulfide, which should not be confused with the molecular shapes predicted by VSEPR theory.
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