Question

The coordination number of sodium chloride is:

• A. 4
• B. 8
• C. 6
• D. 12

Answer 1

The correct option is C 6

In $NaCl$ crystal structure, each Na is surrounded by 6 $C{l}^{-}$ ions and each $C{l}^{-}$ is surrounded by 6 $N{a}^{+}$ ions.

So co-ordination number of $Na$ is 6.

Hence, the correct answer is option $\text{A}$.