Answer:
Element with Z = 15 is phosphorus. It
is a non-metal and forms a covalent hydride. It behaves as a weak base.
Element with Z = 19
is potassium, l e., an alkali
metal. It is highly electropositive and forms an ionic hydride (KH). It reacts
with water and evolves\[{{\text{H}}_{\text{2}}}\]. Element with Z = 23 is
vanadium, i.e., a transition metal. It forms an interstitial hydride \[(V{{H}_{16}})\].
Element with Z = 44 is ruthenium, i.e., a transition metal
of group 8. It does not form any hydride.
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