Explain the following term with a suitable example:
$(iii)$ Interstitials

(N/A) $(iii)$ Interstitials: Interstitial defect is shown by non-ionic solids.
This type of defect is created when some constituent particles (atoms or molecules) occupy an interstitial site of the crystal.
The density of a substance increases because of this defect.
Example: In a crystal lattice,if extra atoms occupy the empty spaces between the regular lattice sites,it is called an interstitial defect.