(B) In a sodium chloride $(NaCl)$ crystal,which adopts a rock salt structure,each $Na^{+}$ ion is surrounded by $6$ $Cl^{-}$ ions,and each $Cl^{-}$ io

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(B) In a sodium chloride $(NaCl)$ crystal,which adopts a rock salt structure,each $Na^{+}$ ion is surrounded by $6$ $Cl^{-}$ ions,and each $Cl^{-}$ ion is surrounded by $6$ $Na^{+}$ ions.Therefore,the coordination number of $Na^{+}:Cl^{-}$ is $6:6$,meaning there are $6$ equidistant oppositely charged ions.