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Identify the nature of hydrides that are...

Identify the nature of hydrides that are formed by the elements of atomic numbers 15, 19, 23, 44 with dihydrogen. Compare their reactivity towards water.

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(i) Element of atomic number 15 belong to p-block and fonns covalent hydride `(PH_3)`.
(ii) Element of atomic number 19 belong to s-block and forms saline hydride (KH).
(iii) Element of atomic no. 23 belong to d-block and fonns interstitial hydride `VH_(1.6)` which is a non-stiochiometric hydride.
(iv) Element of atomic number 44 belong to d-block :-it is ruthenium. It does not from any hydride
(v) Only ionic hydride KH reacts violetly with water and involved in hydrogen gas production.
`KH+H_2OtoKOH+H_2uparrow`
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  • The atomic number of the elements that exhibit natural radioactivity is:

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