How many molecules are there in the unit cell of sodium chioride?A. 2B

1.	How many molecules are there in the unit cell of sodium chioride?A. 2B. 4C. 6D. 8
Answer» Correct Answer - B In NaCl (rock salt): Number of `Na^(+)` ions =12 (at edge centers) `xx(1)/(4)+1` (at body centre)`xx1=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, ex`-NaNO_(3),CaSO_(4)`, calcite `CaCO_(3),HgS`

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How many molecules are there in the unit cell of sodium chioride?A. 2B. 4C. 6D. 8

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