Rubidium is in Group I of the Periodic Table, whereas bromine is in Group VII. When rubidium reacts with bromine, an ionic compound is produced. Which row shows the electron change for rubidium and the correct formula of the rubidium ion?
- Aelectron gained, $\text{Rb}^+$
- Belectron gained, $\text{Rb}^-$
- Celectron lost, $\text{Rb}^+$
- Delectron lost, $\text{Rb}^-$