why is rubidium stored in oil
Confidence votes 8. To ensure purity and safety, Rubidium (Rb) must be kept in a dry mineral oil or in a vacuum. It needs to be stored in this way because it is highly reactive with air and water. Learn About the Element Rb Rubidium (Rb) is a natural element that can be found in various sources, including pollucite, carnallite, and leucite. 2  It is most abundant in a crystal called lepidolite.