Ncert Exercises & Solutions

Same coordination number for cations and anions is present in:

1.	Cl^- ions form Fcc lattice and Na⁺ ions occupy all octahedral voids of the unit cell.
2.	Ca²⁺ ions form Fcc lattice and F^- ions occupy all the eight tetrahedral voids of the unit cell.
3.	O^2- ions form Fcc lattice and Na⁺ ions occupy all the eight tetrahedral voids of the unit cell.
4.	S^2- ions form Fcc lattice and K⁺ ions go into alternate tetrahedral voids of the unit cell.

HINT: Octahedral void coordination number is 6

Explanation:

NaCl crystals have rock salt structures having Fcc lattice in which Cl^- ions are present at Fcc lattice points and face center and Na⁺ occupies all the octahedral void of given unit cell.

Where, coordination number of Na⁺ =6
coordination number of Cl^- = 6

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