Question

Each unit cell of $NaCl$ consists of $14C{l}^{-}$ ions and ________.

• A. $13N{a}^{+}$ ions
• B. $14N{a}^{+}$ ions
• C. $6N{a}^{+}$ ions
• D. $8N{a}^{+}$ ions

Answer 1

Answer: (A)

$13N{a}^{+}$ ions

In NaCl, $13$ octahedral voids (12 edge cetres + 1 body centre) are occupied by $N{a}^{+}$ and $14$ lattice points (8 corners + 6 face centres) are occupied by $C{l}^{-}$.