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What do you expect the nature of hydride...

What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15, 19, 23 and 44 with dihydrogen? Compare their behaviour towards water.

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a. Element with atomic number, `Z=15`,i.e., phosphourous `(P)` is a non-metal and hence the hydride formed is covalent, i.e. `PH_(3)`
b. Element with `Z=19` is potassium `(K)` an alkali metal and hence the hydride formed is ionic , i.e. `KH`.
c. Element with `Z=23` , is a transition metal, i.e. vanadium `(V)` and hence the hydride formed is metallic or interstitial .`(VH_(0.56))`
d. Element with `Z=44` is a transition metal, i.e. ruthenicum `(Ru)` and does not form any hydride (hydride gap). Behaviour towards water:Only ionic hydrides react with water. Forming corresponding metal hydroxide and evolve `H_(2)` gas.
`KH_(s)+H_(2)O_(l)to KOH_(aq)+H_(2)(g)`
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