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francium

   Also found in: Medical, Financial, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
fran·ci·um  (frns-m)
n. Symbol Fr
An extremely unstable radioactive element of the alkali metals, produced artificially from actinium or thorium, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1. See Table at element.

[After France.]

francium [ˈfrænsɪəm]
n
(Chemistry / Elements & Compounds) an unstable radioactive element of the alkali-metal group, occurring in minute amounts in uranium ores. Symbol: Fr; atomic no.: 87; half-life of most stable isotope, 223Fr: 22 minutes; valency: 1; melting pt.: 27°C; boiling pt.: 677°C
[from New Latin, from France + -ium; so-called because first found in France]

francium  (frns-m)
Symbol Fr
An extremely unstable, radioactive element of the alkali group. It is the heaviest metal of the group. Francium occurs in nature, but less than 28.35 g (1 oz) is present in the Earth's crust at any time. It has approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1. See Periodic Table.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.francium - a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Translations
francium [ˈfrænsɪəm] Nfrancio m


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? Mentioned in ? References in periodicals archive
 
At number 87 in the periodic table, francium is the least stable of the first 103 elements.
A Cerium (Ce) B Sulfur (S) C Zirconium (Zr) D Francium (Fr) B.
To study subtle nuclear effects, the researchers hope to use the same method to trap francium atoms, which exist only as short-lived, intensely radioactive isotopes.
 
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