Interstitial hydrides are formed by
s-block metals
p-block metals
d-block metals
All of these
Interstitial hydrides are formed when hydrogen reacts with transition metals and occupies the interstitial spaces in the metal lattice. Ex: Palladium absorbs
Hydrogen and forms Palladium hydride.
Additionally,
Ionic hydrides are formed when hydrogen reacts with highly electropositive s-block elements except and
.
have covalent character.
Covalent hydrides are compounds of hydrogen and non-metals due to their similarity in electronegativity. As non-metals are present in p−block, hence p−block elements form covalent hydrides.