What dodo it mean by stoichiometric hydrides

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Stoichiometric hydrides are those hydrides of elements, usually metals, that follow the Law of constant composition. It means that the chemical composition or the proportion of hydrogen and metal in the compound does not vary with the source and method of preparation and is constant.
Most s-block elements form stoichiometric hydrides.These hydrides are ionic in nature.Hydride ions have comparable sizes(208pm) with alkali metal ions.Hence strong binding forces exists between the constituent metal and hydride ion. As a result, stoichometric hydrides are formed.

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