Final answer:
The ionic compound NH4Br is named ammonium bromide, combining the names of the ammonium cation and the bromide anion.
Step-by-step explanation:
The student has asked to name the ionic compound NH4Br. This compound consists of the ammonium ion (NH4+) and the bromide ion (Br-). When naming ionic compounds, the cation name is given first, followed by the anion name. Therefore, the proper name for NH4Br is ammonium bromide.
Ammonium is a polyatomic ion with a positive charge, which comes from the weak base ammonia (NH3). Bromide derives from the strong acid hydrobromic acid (HBr), and nonetheless, NH4Br forms an acidic salt since ammonium ions come from a weak base. This is an important reminder when considering the properties of such a compound.