| LC control no. | sh 85051541 |
|---|---|
| LC classification | QD181.F7 General and inorganic chemistry QD412.F7 Organometallic chemistry |
| Topical heading | Francium |
| Variant(s) | Actinium K Alkalinium Catium Eka-cesium Moldavium Virginium |
| See also | Alkali metals Radioactive substances |
| Found in | Wikipedia, Sept. 9, 2012 (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; was the last element discovered in nature, rather than by synthesis) Emsley, J. Nature's building blocks, 2011 (Francium; element 87; proposed names: alkalinium (symbol Ak); virginium (symbol Vi or Vm); moldavium (symbol Ml); catium; element 87 was discovered in 1939 by French physicist Marguerite Perey at the Curie Institute; francium is an intensely radioactive metal; member of group I (row 7s), also known as the alkali metal group, of the periodic table; was the last element to be discovered in Nature) |
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