In the rock salt structure of NaCl, the coordination numbers of Na+ and Cl- are, respectively,

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In the rock salt structure of $NaCl$ , the coordination numbers of $Na X^{+}$ and $Cl X^{-}$ are, respectively,

In NaCl each

Na X^{+}

sits in an octahedral void of the ccp

Cl X^{-}

lattice, so it touches 6

Cl X^{-}

ions, and by symmetry each

Cl X^{-}

touches 6

Na X^{+}

. The coordination numbers are 6 and 6.