1. Tardigrade
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  3. Chemistry
  4. How many effective Na + and Cl - ions are present respectively in a unit cell of NaCl solid (Rock salt structure) if ions along line connecting opposite face centres are absent?

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Q. How many effective $Na ^{+}$ and $Cl ^{-}$ ions are present respectively in a unit cell of $NaCl$ solid (Rock salt structure) if ions along line connecting opposite face centres are absent?

The Solid State

Solution:

Number of $Na ^{+}=4-1=3$

Number of $Cl ^{-}=4-2 \times \frac{1}{2}=3$