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Also known as Fr, element 87, 87Fr, catium, eka-cesium, eka-caesium
Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain in which it appears), has a half-life of only 22 minutes. It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Francium's isotopes decay quickly into astatine, radium, and radon. The electronic structure of a francium atom is [Rn] 7s1; thus, the element is classed as an alkali metal.
AI overview
Francium is a highly radioactive chemical element that decays so quickly its most stable form lasts only 22 minutes, making it extremely rare and difficult to study. As the second-most electropositive alkali metal, francium is primarily of scientific interest rather than practical use, since its extreme instability prevents it from being applied in everyday applications.
AI-generated from the Wikipedia summary — may contain errors.
Chemical data
- Formula
- Fr
- Molecular weight
- 223.01973 g/mol
- IUPAC name
- francium
- SMILES
- [Fr]
- InChIKey
- KLMCZVJOEAUDNE-UHFFFAOYSA-N
- Polar surface area
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Formal charge
- 0
via PubChem
Research
55 papers- Francium ion source with novel methods of target heating and beam characterization.The Review of scientific instruments · 2023