JEE · NEET Previous Year Question

Calculate the coordination number of ${\text{Na}}^{+}$in $\text{NaCl}$ crystal, given radius of ${\text{Na}}^{+}$and ${\text{Cl}}^{-}$are $95\text{pm}$ and $181\text{pm}$ respectively.

Topic: JEE PYQ

Answer: C. Full step-by-step solution below.