Question

Elements of which of the following groups do not form hydrides?

• A. $1,2,3$
• B. $3,4,5$
• C. $7,8,9$
• D. $6,7,8$

Answer 1

Answer: (C)

$7,8,9$

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.

Hence, option C is correct.