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

What do you expect the nature of hydrides is, if formed by elements of

1.	What do you expect the nature of hydrides is, if formed by elements of atomic numbers 15,19,23,44 with dry dihydrogen ? Compare their behavoiur towards water.
Answer» Solution :(i) ELEMENT with Z =15 is a non-metal (i.e. P)and hence forms covalent hydride (i.e. `PH_(3)`) (ii) Element with Z=19 is an alkali metal (i.e. K) and hence forms saline or ionic hydride (i.e. `K^(+)H^(-)`) (III) Element with atomic number Z=23 is a transition metal (i.e. V) of group 3 and hence forms a metallic or insterstitial hydride (i.e. `VH_(0.56)`) (iv) Element with Z=44 is a transition metal (i.e. Ru) of group 8 and hence does not FORM any hydride (hydride GAP). Behaviour towards water. Only ionic hydrides react with water EVOLVING `H_(2)` gas. Thus, `2KH(s) + 2H_(2)O(s) to 2KOH (aq) + 2H_(2)(q)`