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

Options

  1. A6,1
  2. B1,6
  3. C6,6
  4. D5,5

Correct answer

C. 6,6

Step-by-step solution

In the NaCl (sodium chloride) crystal lattice, each sodium ion ( Na ⁺ ) is surrounded by 6 chloride ions ( Cl ⁻ ), and each chloride ion is surrounded by 6 sodium ions. This arrangement is known as a face-centered cubic (FCC) structure, where each ion is in contact with 6 nearest neighbours in all directions. This high coordination number of 6 ensures strong electrostatic interactions between ions, contributing to the stability of the crystal lattice and the characteristic properties of NaCl .

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