The bonding in metallic or non-stoichiometric hydrides is:
Covalent bonding
Ionic bonding
Partially covalent and metallic bonding
Partially ionic and metallic bonding
As we have learnt,
Metallic hydrides are formed by most of the d-block and f-block elements. These are non -stoichiometric in nature. In these hydrides, hydrogen exists in the atomic rather than ionic form (but partially ionic form).
Therefore, the option number (4) is correct.
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