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  4. In NaCl crystal each Cl− ion is surrounded by

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Q. In $ NaCl $ crystal each $ Cl^− $ ion is surrounded by

UPSEEUPSEE 2009

Solution:

$ NaCl $ has octahedral structure.

In $NaCl$ crystal, $Cl ^{-}$ ions adopt cubic close packed arrangement and $Na ^{+}$ ions occupy all the octahedral sites. Therefore, $Na$ and $Cl$ have $1: 1$ stoichiometry. In other words, each $Na ^{+}$ ion is surrounded by six $Cl ^{-}$ ions which are disposed towards the corners of a regular octahedron. Similarly, each $Cl ^{-}$ ion is surrounded by six $Na ^{+}$ ions.