The number of nearest neighbours and next nearest neighbours of an $Na^{+}$ ion in a crystal of $NaCl$ are respectively
- A$6 Na^{+}, 12 Cl^{-}$
- B$6 Cl^{-}, 12 Na^{+}$
- C$12 Cl^{-}, 12 Na^{+}$
- D$6 Cl^{-}, 6 Na^{+}$
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