Question

The single-bonded metallic radius of sodium is $157$ pm. Assume that the increment between radii of different magnitudes is $60$ pm.The van der Waals' radius $Na$ in pm is $(209+x)$. Find value of $x$.

Answer 1

Metallic radius is smaller than van der Waals' radius.

The single-bonded metallic radius of sodium is $157$ pm.

The increment between radii of different magnitudes is $60$ pm.

The van der Waal's radius of $Na$ in pm is $157+60=217pm$

$209+x=217$

$\Rightarrow Hence,x=8$