NH3, commonly known as ammonia, is arranged as a T-shaped molecule with nitrogen at its center and three hydrogen atoms at its extremities. Each hydrogen atom is covalently bonded to the nitrogen via an electron pair, and another pair of electrons is attached to the nitrogen atom's outer shell.
This structure renders the ammonia molecule polar, which facilitates its suspension in water. Much of the ammonia used for household applications is ammonium hydroxide, which is the result of ammonia and water mixing. The molecules of each compound are attracted to molecules of the other, and they readily form robust hydrogen bonds.