Final answer:
The ionic compound Rb₃N is named rubidium nitride, which follows the naming guidelines of IUPAC for simple ionic compounds.
Step-by-step explanation:
The ionic compound Rb₃N is composed of rubidium (Rb) and nitrogen (N). According to the IUPAC nomenclature guidelines for naming simple ionic compounds, the name of the cation (rubidium in this case) is given first, followed by the name of the anion (nitrogen in this instance, which becomes nitride as an anion). As rubidium belongs to the group of metals that do not exhibit more than one ionic charge, the cation is simply named rubidium. For the anion, when nitrogen gains three electrons to form an anion, it is called nitride. Therefore, the name of the compound Rb₃N is rubidium nitride.