Be and Mg from amongst the p-block elements and most of the d-block elements give metallic or interstitial hydrides on reacting with hydrogen. The density of each compound is less than that of the metal itself and the properties are not much different from that of the metal. They give out hydrogen easily and are strong reducing agents. This suggests that hydrogen is present in the atomic state. these compounds are non-stoichiometric. the f-block elements (i.e., lanthanide and actinides) also form non-stoichiometric hydrides. These hydrides have lower densities than their respective metals. The metals of group 7,8 and 9 do not form hydrides. This region of the periodic table is called 'hydride gap'. Interstitial hydride can not be used as,

Be and Mg from amongst the p-block elements and most of the d-block el

1.	Be and Mg from amongst the p-block elements and most of the d-block elements give metallic or interstitial hydrides on reacting with hydrogen. The density of each compound is less than that of the metal itself and the properties are not much different from that of the metal. They give out hydrogen easily and are strong reducing agents. This suggests that hydrogen is present in the atomic state. these compounds are non-stoichiometric. the f-block elements (i.e., lanthanide and actinides) also form non-stoichiometric hydrides. These hydrides have lower densities than their respective metals. The metals of group 7,8 and 9 do not form hydrides. This region of the periodic table is called 'hydride gap'. Interstitial hydride can not be used as,
Answer» storing `H_(2)` CATALYSTS for HYDROGENATION reaction ROCKET PROPELLANT Electric conductor Solution :Interstitialhydride can not be used as Rocket propellent.