Answer:
The elements with atomic numbers 17 and 20 are chlorine and calcium. Their corresponding hydrides are \[HCl\] and \[Ca{{H}_{2}}\]. While \[HCl\] dissociates in water to give acidic solution, \[Ca{{H}_{2}}\] reacts with water to evolve hydrogen gas and the resulting solution is basic in nature.
\[HCl\xrightarrow{(aq)}\,{{H}^{+}}(aq)+C{{l}^{-}}(aq)\]
\[Ca{{H}_{2}}+2{{H}_{2}}O\xrightarrow{\,}\,Ca{{(OH)}_{2}}\,+{{H}_{2}}\].
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