Facts About Rubidium
When you purchase through links on our web site , we may earn an affiliate commission . Here ’s how it works . atomic number 37 is a silvery - clean and very soft metallic element — and one of the most extremely responsive elements on the periodical table . atomic number 37 has a density about one and a half meter that of water and is solid at room temperature , although the metallic element will melt if it ’s just a bit warmer , according toChemicool ....