Final answer:
The name of the ionic compound Rb3N is Rubidium Nitride.
Step-by-step explanation:
The name of the ionic compound Rb3N is Rubidium Nitride. Rubidium (Rb) is the cation with a charge of +1, and Nitride (N) is the anion with a charge of -3. To balance the charges, three Rb ions are needed to combine with one N ion, resulting in the formula Rb3N. Therefore, the correct answer is a) Rubidium Nitride.