Question

Excess electrons in electron rich hydrides are present as ________

Answer 1

Lone pairs: A pair of electrons occupying an orbital in an atom or molecule and not directly involved in bonding are called a lone pair of that atom.

Electron rich hydrides

• Electron-rich hydrides are the compounds of hydrogen which contain lone pairs of electrons.
• Examples of electron-rich hydrides are the elements of groups 15-17 form such compounds (${\mathrm{NH}}_3$ has one lone pair, water has two and $\mathrm{HF}$ has three lone pairs).
• Due to the presence of lone pair of electrons, they can act as Lewi's base.

Therefore, electron-rich hydrides have excess electrons that are present as lone pair.