All the noble gases except helium crystallize with fcc structures. Derive an equation relating the atomic radius to the density of an fcc solid of given molecular weight and apply it to deduce the atomic radii of the noble gases.

Answer 1

mass atom = #atoms/unit cell x atomic mass atom/6.022E23
Use density to convert mass to volume.
a(cell edge) = V^1/3

4r = a*sqrt(2)

Answer 2

thank you!!i understand now