Elements of which of the following group(s) of periodic table do not form hydrides.

Group 7, 8, 9

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Group 1

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Groups 15, 16, 17

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Group 14

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Solution

The correct option is A Group 7, 8, 9
Metallic hydrides are formed when hydrogen molecule reacts with the d- and f- block elements. These are usually formed by transition metals but Group 7, 8, 9 of periodic table does not form any hydride. Hence, this region of the periodic table from group 7 to group 9 is known as the hydride gap.
Group 1 form ionic hydrides due to their electropositive nature.
Group 14, 15, 16 and 17 for covalent hydrides.

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