Number of `Na^(+)` and `Cl^(-)` ions associated with each a unit cell of `NaCl` is:

Find the number of Na^(+) ions and Cl^(-) ions associated with each in a unit cell and NaCl .

How many ion pairs present per each unit cell of NaCl ?

r_(Na^(+))" and " r_(Cl^(-)) represent radius of Na^(+) and Cl^(-) ions respectively. If 'n' is the number of NaCl units per cell then give the eqution you will use to obtain molar volume.

If the positions of Na^(+) and Cl^(-) are interchanged in NaCl, having fcc arrangement of Cl^(-) ions then in the unit cell of NaCl

Assertion. The sum of the radii of Na^(+) and Cl^(-) ions in NaCl cystal is 281 pm Hence, edge of the unit cell is 281 pm. Reason. Edge of the unit cell is the distance between the centres of Na^(+) and Cl^(-) ions touching each other.