Calculate the radius of the largest atom that could be inserted into an interstitial position in si without causing any distortion. assume that all of the atoms can be treated as touching hard spheres and take the radius of si atoms to be rsi. indicate where in the si lattice such as interstitials would be located. now calculate the radius of the largest atom that could be inserted into an interstitial position in an fcc structure with touching hard sphere atoms of the same radius, rsi.