Question

The number of $Cl^{-}$ ions required to form ccp lattice of NaCl structure are

• A. 6
• B. 12
• C. 13
• D. 14

Answer 1

Answer: (D)

14

Answer 2

For forming ccp (fcc) lattice, $Cl^{-}$ ions at the comers = 8 and $Cl^{-}$ ions at the face centres - 6. Hence, total = 14