If the distance between Na+ and Cl- ions in NaCl crystal is 265 pm, then edge length of the unit cell will be:
Correct answer: B. 530 pm
- A. 265 pm
- B. 530 pm
- C. 795 pm
- D. 132.5 pm
Explanation
As we know, Edge length = 2 x distance between Na+ & Cl- Edge length = 2 x 265 = 530 pm Hence, option B is correct.
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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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