Let the edge length of the cube be a and radius of atom be r. Now, in simple cube, number of atoms present =1∕8×8=1 So, volume occupied =1×‌
4
3
πr3 Now, in simple cube atoms at corners will be touching each other. ⇒‌‌a=2r⇒r=a∕2 Volume of cube =a3 So, fraction of total volume occupied =‌