Hydride gap' is referred to which region of the periodic table ? (1) Group 3,4,and 5 (2) Group 5,6 and 7 (3) Group 7,8 and 9 (4) Group 3,5 and 7

Answer: (3)

Compounds of hydrogen with less electronegative elements are known as hydrides. So when hydrogen reacts with any other element the product formed is considered to be a hydride. If we closely observe the periodic table hydrides formation is not seen from 7th, 8th and 9th groups elements and this condition is known as hydride gap.

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