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Q.
Elements of which of the following group(s) of periodic table do not form hydrides
Hydrogen
Solution:
The region of the periodic table from the group $7$ to $9$ is referred to as the hydride gap as they do not form hydrides.
Examples of such elements are $Mn, Fe, Co, Ru$ etc. These elements do not form hydrides on account of low affinity for hydrogen in their normal oxidation states.