Elements of which of the following group(s) of periodic table do not form hydrides.
A. Groups 7, 8, 9
B. Group 13
C. Groups 15, 16, 17
D. Group 14
When the metals of group 7,8,9 react with Hydrogen, they accept the only negative electron of H atom and the metal ion becomes negatively charged and a ligand is formed in this way.
If the opposite would have occurred, like if the metal lost an electron and became positively charged then the compound formed with hydrogen would be known as a hydride.
This trait seen is known as hydride gap.
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