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