Question

A molecule of ammonia $\left({\text{NH}}_3\right)$ contains only single bonds. Explain the reason.
[5 Marks]

Answer 1

An ammonia molecule contains one nitrogen and three hydrogen atoms.
The nitrogen atom contains five valence electrons. To achieve the nearest noble gas electronic configuration, nitrogen atom needs three more electrons.
Similarly, a hydrogen atom contains one valence electron and to achieve the nearest noble gas electronic configuration, it needs one more electron.
[2 Marks]

The nitrogen atom shares one electron each with three hydrogen atoms and forms three single covalent bonds.
[1 Mark]

The structure of ${\text{NH}}_3$ is given below:

[2 Marks]