Question

What are electron-rich hydrides?

Answer 1

Electron rich hydrides

• These have more electrons than normal covalent bonds. The excess electrons are present in the form of lone pairs. Examples are the hydrides of groups $15,16$ and $17$ such as ${\mathrm{NH}}_3,{\mathrm{H}}_2\mathrm{O}$ etc.

Examples

• ${\mathrm{NH}}_3$has one lone pair, ${\mathrm{H}}_2\mathrm{O}$ has two lone pairs, and $\text{HF}$has three lone pairs.
• So, ${\mathrm{NH}}_3$, ${\mathrm{H}}_2\mathrm{O}$, and $\text{HF}$ are electron rich hydrides.