* One nitrogen atom (N): This atom has 7 protons, 7 neutrons, and 7 electrons.

* Three hydrogen atoms (H): Each hydrogen atom has 1 proton, 1 neutron, and 1 electron.

Structure:

The nitrogen atom forms three covalent bonds with the hydrogen atoms. Each hydrogen atom shares its single electron with the nitrogen atom, creating a stable molecule. The shape of the ammonia molecule is a trigonal pyramidal shape, with the nitrogen atom at the apex and the three hydrogen atoms forming the base.

Key Properties:

* Colorless gas: Ammonia is a colorless gas at room temperature.

* Strong odor: It has a pungent, characteristic odor.

* Highly soluble in water: Ammonia readily dissolves in water, forming ammonium ions (NH₄⁺) and hydroxide ions (OH⁻).

* Basic: Ammonia solutions are alkaline, meaning they have a pH greater than 7.

* Combustible: Ammonia is flammable in air.

Uses:

Ammonia has a wide range of applications, including:

* Fertilizer production: It's a key ingredient in fertilizers, providing nitrogen to plants.

* Industrial chemicals: It's used to produce various chemicals, such as nitric acid and urea.

* Cleaning agents: It's a component in many household cleaning products.

* Refrigerant: It's used as a refrigerant in some applications.