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  4. The number of Cl- ions required to form ccp lattice of NaCl structure are

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

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Solution:

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