Question

How many $C{l}^{-}$ions are there around $N{a}^{+}$ion in $NaCl$ crystal?

• A. 3
• B. 4
• C. 6
• D. 8

Answer 1

Answer: (C)

Each of the $N{a}^{+}$and $C{l}^{-}$ions has coordination number of $6$ Cubical structure of sodium chloride crystal