Thank you for reporting, we will resolve it shortly
Q.
Interstitial compounds are
The d-and f-Block Elements
Solution:
An Interstitial compounds, or interstitial alloy, is a compound formed when an atom with a small enough radius sits in an interstitial 'hole' in a metal lattice. Since there is no proper proportional bonding in every space in the crystal lattice, it is is non-stoichiometric and also neither typically ionic and covalent.