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What do you expect the nature of hydride...

What do you expect the nature of hydrides formed by elements of atomic number 15, 19 ,23 and 44 with hydrogen?

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Atomic number 15 is a non-metal (p) and its hydride is `PH_3` which is covalent .Element with atomic number 19 is an alkali metal (K) which forms ionic hydride.
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