What are metallic/interstitial hydrides? How do they differ from molecular hydrides?

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Solution

Metallic hydrides are non-stoichiometric hydrides formed by many d-block and f-block elements.They are almost always non-stoichiometric and deficient in hydrogen. These hydrides conduc heat and electricity. for example, $L a H_{287}, Y b H_{255}$ etc.
Molecular hydrides are covalent and volatile in nature.for example, $C H_{4}$ .some of the differences between molecular and metallic hydrides are shown here

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