francium
Sign in to saveFrancium 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.
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Article
15 sectionsContents
- Characteristics
- Compounds
- Francium perchlorate
- Francium halides
- Other compounds
- Isotopes
- Applications
- History
- Erroneous and incomplete discoveries
- Perey's analysis
- Occurrence
- Production
- Notes
- References
- External links
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.
As a consequence of its extreme instability, bulk francium has never been seen. Because of the general appearance of the other elements in its periodic table column, it is presumed that francium would appear as a highly reactive metal if enough could be collected together to be viewed as a bulk solid or liquid. Obtaining such a sample is highly improbable since the extreme heat of decay resulting from its short half-life would immediately vaporize any viewable quantity of the element.