What is the coordination number of Na⁺ and Cl⁻ ions in NaCl lattice ?

6, 1

1, 6

6, 6

5, 5

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UPSC NDA-1 – 2024

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In the NaCl crystal lattice, both Na⁺ and Cl⁻ ions have a coordination number of 6.

The NaCl crystal structure is a face-centered cubic (FCC) arrangement where each Na⁺ ion is octahedrally surrounded by six Cl⁻ ions, and similarly, each Cl⁻ ion is octahedrally surrounded by six Na⁺ ions.

The coordination number in an ionic lattice refers to the number of oppositely charged ions immediately surrounding a given ion. This coordination number is determined by the relative sizes of the ions and the need to maximize electrostatic attraction while minimizing repulsion.

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