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- Francium abstract "Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It is one of the two least electronegative elements, the other being caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron.Bulk francium has never been viewed. Because of the general appearance of the other elements in its periodic table column, it is assumed that francium would appear as a highly reflective metal, if enough could be collected together to be viewed as a bulk solid or liquid. However preparing such a sample is impossible, since the extreme heat of decay (the half-life of its longest-lived isotope is only 22 minutes) would immediately vaporize any viewable quantity of the element.Francium was discovered by Marguerite Perey in France (from which the element takes its name) in 1939. It was the last element first discovered in nature, rather than by synthesis. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and decays. As little as 20–30 g (one ounce) exists at any given time throughout the Earth's crust; the other isotopes (except for francium-221) are entirely synthetic. The largest amount produced in the laboratory was a cluster of more than 300,000 atoms.".
- Francium wikiPageExternalLink frconten.htm.
- Francium wikiPageExternalLink 087.htm.
- Francium wikiPageExternalLink index.html.
- Francium wikiPageID "10821".
- Francium wikiPageRevisionID "606739340".
- Francium book "Alkali metals".
- Francium book "Chemical elements".
- Francium book "Francium".
- Francium book "Period 7 elements".
- Francium commons "y".
- Francium hasPhotoCollection Francium.
- Francium portal "Chemistry".
- Francium v "y".
- Francium vSearch "Francium atom".
- Francium wikt "y".
- Francium wiktSearch "francium".
- Francium subject Category:Alkali_metals.
- Francium subject Category:Chemical_elements.
- Francium subject Category:Francium.
- Francium comment "Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It is one of the two least electronegative elements, the other being caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon. As an alkali metal, it has one valence electron.Bulk francium has never been viewed.".
- Francium label "Francio".
- Francium label "Francio".
- Francium label "Francium".
- Francium label "Francium".
- Francium label "Francium".
- Francium label "Francium".
- Francium label "Frans".
- Francium label "Frâncio".
- Francium label "Франций".
- Francium label "فرانسيوم".
- Francium label "フランシウム".
- Francium label "钫".
- Francium sameAs Francium.
- Francium sameAs Francium.
- Francium sameAs Φράγκιο.
- Francium sameAs Francio.
- Francium sameAs Frantzio.
- Francium sameAs Francium.
- Francium sameAs Fransium.
- Francium sameAs Francio.
- Francium sameAs フランシウム.
- Francium sameAs 프랑슘.
- Francium sameAs Francium.
- Francium sameAs Frans.
- Francium sameAs Frâncio.
- Francium sameAs m.025rqcb.
- Francium sameAs Q671.
- Francium sameAs Q671.
- Francium wasDerivedFrom Francium?oldid=606739340.
- Francium isPrimaryTopicOf Francium.