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How many molecules are there in the unit...

How many molecules are there in the unit cell of sodium chioride?

A

2

B

4

C

6

D

8

Text Solution

Verified by Experts

The correct Answer is:
B
In NaCl (rock salt) : Number of `Na^(+)` ions = 12 (at edge centers) `xx 1/4 + 1` (at body centre) `xx 1 = 4`. Number of `Cl^(-)` ions = 8 (at corners) `xx 1/8 + 6` (at face centre) `xx 1/2 = 4`. Thus 4 formula units per unit cell.
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