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Question
In which of the following structures coordination number for cations and anions in the packed structure will be same?
Options
Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.
Ca2+ ions form fcc lattice and F– ions occupy all the eight tetrahedral voids of the unit cell.
O2– ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell.
S2– ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.
Solution
Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.
Explanation:
NaCl crystals have rock salt structure having fee lattice in which Cl– ions are present at fee lattice points and face centre and Na+ occupies all the octahedral voids of given unit cell.
Where, coordination number of Na+ = 6
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