روبیدیم
Also known as Rb, element 37, 37Rb
Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. Rubidium is the first alkali metal in the group to have a density higher than water. On Earth, natural rubidium comprises two isotopes: 72% is a stable isotope Rb, and 28% is slightly radioactive Rb, with a half-life of 48.8 billion years – more than three times as long as the estimated age of the universe.
AI overview
Rubidium is a soft, silvery-grey metal that belongs to the alkali metal group and is notable for being the first alkali metal denser than water. It occurs naturally in two forms on Earth: one stable form and one very slightly radioactive form with an extremely long half-life of nearly 49 billion years.
AI-generated from the Wikipedia summary — may contain errors.
Chemical data
- Formula
- Rb
- Molecular weight
- 85.468 g/mol
- IUPAC name
- rubidium
- SMILES
- [Rb]
- InChIKey
- IGLNJRXAVVLDKE-UHFFFAOYSA-N
- Polar surface area
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Formal charge
- 0
via PubChem