The elements of atomic numbers 15, 19, 23, and 44 are nitrogen, potassium, vanadium, and ruthenium respectively.
1) Hydride of nitrogen:
Hydride of nitrogen (NH3) is a covalent molecule. This hydride molecule contains excess of electrons and hence it is electron rich hydride molecule.
2) Hydride of potassium:
This hydride is ionic in nature because of the strong electropositive nature of potassium ion and hence it is crystalline in nature.
3) Hydrides of Vanadium and Ruthenium:
d and f-block elements form non-stoichiometric hydrides and vanadium and ruthenium also belong to the d-block of the periodic table. Hydrides of vanadium and ruthenium are therefore, metallic in nature having a deficiency of hydrogen.
4) Behaviour of hydrides towards water:
Potassium hydride reacts violently with water and the reaction is given as below:
KH + H2O → KOH + H2
Ammonia (NH3) behaves as a Lewis base and the reaction of ammonia with water is given as below:
NH3 + H2O ß→ OH- + NH4+
Vanadium and ruthenium hydride do not react with water.
Hence, the increasing order of reactivity of the hydrides is:
(V, Ru) H < NH3< KH.
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