Question

Define void. Tungsten crystalizes into BCC unit. If the edge length of this unit structure is $300pm$, calculate the radius of tungsten atom.

Answer 1

Void denotes gaps between particles in a structure. In chemical world, it is defined as vacant space between constituent particles in a closed pack structure.

In a $BCC$ cell,

$a=\frac{4}{\sqrt{3}}r$

$\Rightarrow r=\frac{\sqrt{3}}{4}a$

$r=\frac{\sqrt{3}}{4}\times 300pm=129.9pm$

Hence, the radius of the tungsten atom is $129.9pm$.