Rubidium is in Group I of the Periodic Table, while bromine is in Group VII. When rubidium reacts with bromine, an ionic compound is formed. Which row gives 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; $\text{Rb}^-$