How many molecules are there in the unit cell of sodium chloride

# How many molecules are there in the unit cell of sodium chloride

1. A

2

2. B

4

3. C

6

4. D

8

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### Solution:

In $\mathrm{NaCl}$ (rock salt) :

Number of ${\mathrm{Na}}^{+}$ ions (at edge centers) $x\frac{1}{4}+1$(at body centre)$x1=4.$

Number of ${\mathrm{Cl}}^{-}$ ions $=8$(at corners)$x\frac{1}{8}+6$(at face centre)$x\frac{1}{2}=4.$

Thus $4$ formula units per unit cell. excalcite

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