Question

How many ${Cl^{-}}$ ions are there around ${Na^{+}}$ ion in $NaCl$ crystal ?

• A. 3
• B. 4
• C. 6
• D. 8

Answer 1

Answer: (C)

6

Answer 2

Each of the ${Na^{+}}$ and ${Cl^{-}}$ ions has coordination number of 6. Cubical structure of sodium chloride crystal